http://www.theoremoftheday.org/ A gallery whose exhibits are the crowning achievements of mathematics: its theorems. http://www.theoremoftheday.org/TotDLogo.jpg http://www.theoremoftheday.org/ http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Binomial/Lame/TotDLame.pdf Theorem of the Day has a 'new acquisition': Lamé's Theorem Announce: Theorem no. 87 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/CauchyKovalevskaya/TotDCauchyKovalevskaya.pdf Theorem of the Day has a 'new acquisition': the Cauchy-Kovalevskaya Theorem Announce: Theorem no. 88 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GroupTheory/MChan/TotDMChan.pdf The theorem of Melody Chan (no. 51) has a corrected and improved presentation Update: #1 to Theorem 51 http://www.theoremoftheday.org/Theorems.html Non-trivial corrections have been made to the pictures illustrating the DPRM Theorem (no. 43) and Moufang's Theorem (no. 61) Update: #1 to Theorem 43 and Theorem 61 http://www.theoremoftheday.org/Shop/Shop.htm Theorem of the Day Gallery Shop now open for browsing News: Shop open for browsing http://www.theoremoftheday.org/Shop/Shop.htm You can now buy the Theorem of the Day 2008 calendar "12 Theorems by Women Mathematicians" at the on-line shop News: Shop open for purchases http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Statistics/AbelHurwitz/TotDAbelHurwitz.pdf Theorem of the Day has a 'new acquisition': the Abel-Hurwitz Binomial Theorem Announce: Theorem no. 89 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Binomial/Binomial/TotDBinomial.pdf Non-trivial corrections have been made to the description of the Binomial Theorem Update: #1 to Theorem 47 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/Lutz/TotDLutzNagell.pdf A correction has been made to the Lutz-Nagell Theorem concerning the point of order 2 (it isn't rational! - thanks to Shaun Stevens at UEA for pointing that out) Update: #1 to Theorem 81 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Cardano/TotDCardano.pdf Theorem of the Day has a 'new acquisition': Cardano's Cubic Formula. This will be the last theorem added this year; happy 2008 to all my visitors! Announce: Theorem no. 90 http://www.theoremoftheday.org/Shop/Shop.htm T-shirts now available from Theorem of the Day Gallery Shop News: T-shirts available http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/KhinchinCF/TotDKhinchin.pdf Theorem of the Day has a 'new acquisition': Khinchin's Theorem on Continued Fractions. The first new theorem of 2008: Happy New Year to all my visitors! Announce: Theorem no. 91 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Quadratic/TotDQuadratic.pdf Theorem of the Day has a 'new acquisition': The Quadratic Formula. Announce: Theorem no. 92 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/MusicAndArt/Hexachord/TotDHexachord.pdf Theorem of the Day has a 'new acquisition': the Generalised Hexachord Theorem Announce: Theorem no. 93 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Ramsey/TotDRamsey.pdf A 'Ramsey Theory Contest', proposed by David Cariolaro, has been added to Theorem no. 28: Ramsey's Theorem. News: Ramsey Theory Contest http://www.theoremoftheday.org Search Theorem of the Day by google has been added to the Theorem of the Day homepage. Type in your favourite mathematical term and see what comes up! News: google search added http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Convolution/TotDConvolution.pdf Theorem of the Day has two 'new acquisitions': Cayley's Formula and the Convolution Theorem Announce: Theorem nos. 94 and 95 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/Sarrus/TotDSarrus.pdf Theorem of the Day has a 'new acquisition': the Rule of Sarrus Announce: Theorem no. 96 http://www.theoremoftheday.org/Shop/Shop.htm The 2008 wall calendar "12 Theorems by Women Mathematicians" is now reduced in price to £10 + postage and packing News: calendar price reduction http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Cartwright/TotDCartwright.pdf Theorem of the Day has two 'new acquisitions': Nevanlinna's Five-Value Theorem and Cartwright's Theorem Announce: Theorem nos. 97 and 98 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Dilworth/TotDDilworth.pdf A new version of Dilworth's Theorem has been posted. For snooker fans, the old one remains accessible at position 19 in the Complete List. Update: #1 to Theorem 19 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/EstherKlein/TotDEstherKlein.pdf Theorem of the Day has a 'new acquisition': The Happy Ending Problem Announce: Theorem no. 99 http://www.theoremoftheday.org/VisitorsBook/VisitorsBook.htm Theorem of the Day now has a Visitors' Book where you can share your thoughts about theoremoftheday.org or just about theorems in general News: Visitors Book added http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/DoC/TotDDoC.pdf Theorem of the Day has a 'new acquisition': the Design of the Century. This is theorem no. 100 to be added to the site! Please feel free to leave a message of encouragement in our Visitors' Book and thank you for your continued interest! Announce: Theorem no. 100 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/Kepler/TotDKepler.pdf Theorem of the Day has a 'new acquisition': Kepler's Conjecture Announce: Theorem no. 101 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/Viete/TotDViete.pdf Theorem of the Day has a 'new acquisition': Viète's Formula Announce: Theorem no. 102 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Parking/TotDParking.pdf Theorem of the Day has a 'new acquisition': The Parking Function Formula Announce: Theorem no. 103 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/GMR/TotDGMR.pdf Theorem of the Day has a 'new acquisition': The Goins-Maddox-Rusin Theorem on Heron Triangles Announce: Theorem no. 104 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/LogicAndComputerScience/PumpingLemma/TotDPumping.pdf Theorem of the Day has a 'new acquisition': The Pumping Lemma Announce: Theorem no. 105 http://www.theoremoftheday.org/Shop/Shop.htm I have made a final reduction for the last few copies of the 2008 wall calendar "12 Theorems by Women Mathematicians" to to cost price: £7 + postage and packing. Last chance to get this collector's item! News: calendar price final reduction http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/MusicAndArt/Babbitt/TotDBabbitt.pdf Theorem of the Day has a 'new acquisition': Babbitt's Theorem Announce: Theorem no. 106 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/Tverberg/TotDTverberg.pdf Theorem of the Day has a 'new acquisition': The Tverberg Partition Theorem Announce: Theorem no. 107 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/ATST/TotDATST.pdf Theorem of the Day has a 'new acquisition': The Analyst's Travelling Salesman Theorem Announce: Theorem no. 108 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/OR/BHH/TotDBHH.pdf Theorem of the Day has a 'new acquisition': The Beardwood-Halton-Hammersley Theorem Announce: Theorem no. 109 http://www.theoremoftheday.org/Resources/Mathematicians.html Theorem of the Day now has an Index of Mathematicians with more than 150 entries. Find out why it is an advantage for your name to begin 'Ca' if you want to be a famous mathematician! News: Index of Mathematicians added http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/LogicAndComputerScience/DeMorgan/TotDDeMorgan.pdf Theorem of the Day has two 'new acquisitions': The Robbins Problem and De Morgan's Laws Announce: Theorem nos. 110 and 111 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Bregman/TotDBregman.pdf Theorem of the Day has a 'new acquisition': Bregman's Theorem Announce: Theorem no. 112 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/VDW/TotDVDW.pdf Theorem of the Day has a 'new acquisition': van der Waerden's Conjecture Announce: Theorem no. 113 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GroupTheory/Loops/TotDLoops.pdf Theorem of the Day has a 'new acquisition': the Lagrange Property for Moufang Loops Announce: Theorem no. 114 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/Partitions/TotDPartitions.pdf Theorem of the Day has a 'new acquisition': the Hardy-Ramanujan Asymptotic Partition Formula Announce: Theorem no. 115 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Coprimality/TotDCoprimality.pdf Theorem of the Day has a 'new acquisition': the Polynomial Coprimality Theorem Announce: Theorem no. 116 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/ErdosWilson/TotDErdosWilson.pdf Theorem of the Day has a 'new acquisition': a Theorem of Erdos and Wilson on Edge Colouring Announce: Theorem no. 117 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/Catalan/TotDCatalan.pdf Theorem of the Day has a 'new acquisition': Catalan's Conjecture Announce: Theorem no. 118 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Kneser/TotDKneser.pdf Theorem of the Day has a 'new acquisition': Kneser's Conjecture Announce: Theorem no. 119 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Statistics/Local/TotDLocal.pdf Theorem of the Day has a 'new acquisition': The Lovász Local Lemma Announce: Theorem no. 120 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/Lambert/TotDLambert.pdf Theorem of the Day has a 'new acquisition': The Lambert's Formula Announce: Theorem no. 121 http://www.theoremoftheday.org/ The Theorem of the Day home page now offers a 'Coming Soon' link, so you can see what is in preparation and request a sneak preview! News: Coming Soon added http://www.theoremoftheday.org The Theorem of the Day home page now gives greater prominance to its 'logo', the Fibonacci spiral. This should also appear on the tab of your web browser. News: new image on home page http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Statistics/Local/TotDLocal.pdf A new version of Theorem no. 120, The Lovász Local Lemma, has been posted. Its illustration addresses a subtlety which was missing from the previous version (thanks to Mark Jerrum for suggesting this). Update: #1 to Theorem 120 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Topology/BorsukUlam/TotDBorsukUlam.pdf Theorem of the Day has a 'new acquisition': the Borsuk-Ulam Theorem Announce: Theorem no. 122 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Algebra/Wedderburn/TotDWedderburn.pdf Theorem of the Day has a 'new acquisition': the Wedderburn-Artin Theorem Announce: Theorem no. 123 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Lagrange/TotDLagrange.pdf Theorem of the Day has a 'new acquisition': the Lagrange Interpolation Formula Announce: Theorem no. 124 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Algebra/SkolemNoether/TotDSkolem.pdf Theorem of the Day has a 'new acquisition': the Skolem-Noether Theorem Announce: Theorem no. 125 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/InformationTheory/Liar/TotDLiar.pdf Theorem of the Day has a 'new acquisition': the Asymptotic (Half) Liar Formula Announce: Theorem no. 126 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/LucasLehmer/TotDLucas.pdf Theorem of the Day has a 'new acquisition': the Lucas-Lehmer Test Announce: Theorem no. 127 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/EuclidEuler/TotDEuclidEuler.pdf Theorem of the Day has a 'new acquisition': the Euclid-Euler Theorem Announce: Theorem no. 128 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/MostPerfect/TotDMostPerfect.pdf Theorem of the Day has a 'new acquisition': The Ollerenshaw-Brée Formula Announce: Theorem no. 129 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/Apollonian/TotDSmallApoll.pdf Theorem of the Day has a 'new acquisition': A Theorem on Apollonian Circle Packings Announce: Theorem no. 130 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/DDOLS/TotDDDOLS.pdf Theorem of the Day has two 'new acquisitions': The Existence Theorem for Orthogonal Diagonal Latin Squares and Theaetetus' Theorem on the Platonic Solids Announce: Theorem nos. 131 and 132 http://www.theoremoftheday.org/Shop/Calendar09.htm The 2009 Theorem of the Day calendar "12 Theorems by Women Mathematicians" is now available for free download and will be available to buy in printed format soon. News: 2009 calendar available http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Statistics/TotalProb/TotDTotal.pdf Theorem of the Day has a 'new acquisition': The Total Probability Theorem Announce: Theorem no. 133 http://www.theoremoftheday.org/Shop/Shop.htm The 2009 calendar "12 Theorems by Women Mathematicians" is now available for purchase at the Gallery Shop News: 2009 calendars on sale http://www.theoremoftheday.org/ theoremoftheday.org now offers a link which automatically loads today's theorem on to your screen (thanks to Erik Koelink at Radboud Universiteit for this idea!) News: daily theorem display http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/CoV/TotDCoV.pdf Theorem of the Day has a 'new acquisition': The Change of Variables Theorem Announce: Theorem no. 134 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GroupTheory/Movement/TotDMovement.pdf Theorem of the Day has a 'new acquisition': Praeger's Theorem on Bounded Movement, marking the occasion of Cheryl Praeger's 60th birthday conference in Perth this coming week Announce: Theorem no. 135 http://www.theoremoftheday.org/Shop/Shop.htm The 2009 calendar "12 Theorems by Women Mathematicians" is now reduced in price to £10 + postage and packing. I will be selling them at that price tomorrow at the Open University Winter Combinatorics Meeting, Milton-Keynes News: 2009 calendar price reduction http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Binomial/Derangements/TotDDerangements.pdf Theorem of the Day has a 'new acquisition': Theorems of Euler and Rényi on 'e' Announce: Theorem no. 136 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/QuadraticReciprocity/TotDReciprocity.pdf A corrected version of Theorem no. 29, Gauss's Law of Quadratic Reciprocity, has been posted. In stating the Law its dependence on the second variable q was ommitted (thanks to John Drost for pointing this out to me). Update: #1 to Theorem 29 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Binomial/WallisProduct/TotDWallis.pdf Theorem of the Day has a 'new acquisition': Wallis's Theorem Announce: Theorem no. 137 http://www.theoremoftheday.org/Resources/FAQ.htm Theorem of the Day now has an FAQ page. News: FAG page added http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/LogicAndComputerScience/Pratt/TotDPratt.pdf Theorem of the Day has a 'new acquisition': Vaughan Pratt's Theorem Announce: Theorem no. 138 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/LogicAndComputerScience/Strassen/TotDStrassen.pdf Theorem of the Day has a 'new acquisition': Strassen's Matrix Theorem Announce: Theorem no. 139 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Rigidity/TotDRigidity.pdf Theorem of the Day has a 'new acquisition': a Theorem on Rectangular Tensegrities Announce: Theorem no. 140 http://www.theoremoftheday.org/Resources/Events.htm Theorem of the Day has an embryonic international listing of public events on mathematics to which everyone is welcome to submit items News: events listing added http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/PiffWelsh/TotDPiffWelsh.pdf Theorem of the Day has a 'new acquisition': the Piff-Welsh Theorem Announce: Theorem no. 141 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GroupTheory/RSK/TotDRSK.pdf Theorem of the Day has two 'new acquisitions': Sylvester's Law of Inertia and The Robinson-Schensted-Knuth Correspondence Announce: Theorem nos. 142 and 143 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/MathPhysics/Lieb/TotDLieb.pdf Theorem of the Day has a 'new acquisition': Lieb's Square Ice Theorem Announce: Theorem no. 144 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/ContractionMapping/TotDContraction.pdf Theorem of the Day has a 'new acquisition': The Contraction Mapping Theorem Announce: Theorem no. 145 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/DegreeColourable/TotDDegreeColourable.pdf Theorem no. 70, on vertex-degree colourability of graphs, has been updated to reflect the striking reduction in the upper bound recently proved by Kalkowski, Karonski and Pfender Update: #1 to Theorem 70 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/Panarboreal/TotDPanarboreal.pdf Theorem of the Day has a 'new acquisition': The Panarboreal Formula Announce: Theorem no. 146 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Sophomore/TotDSophomore.pdf Theorem of the Day has a 'new acquisition': The Sophomore's Dream Announce: Theorem no. 147 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/SchurRealZeros/TotDSchurRealZeros.pdf Theorem of the Day has a 'new acquisition': A Theorem of Schur on Real-Rootedness Announce: Theorem no. 148 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/EuclidsPrism/TotDEuclidsPrism.pdf Theorem of the Day has a 'new acquisition': Euclid's Prism Announce: Theorem no. 149 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/HoppingLemma/TotDHoppingLemma.pdf Theorem of the Day has a 'new acquisition': Woodall's Hopping Lemma Announce: Theorem no. 150 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/SmallGaps/TotDSmallGaps.pdf Theorem of the Day has a 'new acquisition': The Short Gaps Theorem Announce: Theorem no. 151 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Cardano/TotDCardano.pdf A new version of Theorem no. 90, Cardano's Cubic Formula, has been posted. The new version has a much more explicit example of how to use the formula to solve cubic equations. Update: #1 to Theorem 90 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/DeMoivre/TotDDeMoivre.pdf Theorem of the Day has a 'new acquisition': de Moivre's Theorem Announce: Theorem no. 152 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/EulerPartition/TotDEulerPartition.pdf Theorem of the Day has a 'new acquisition': Euler's Partition Identity Announce: Theorem no. 153 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Analysis/Remainder/TotDRemainder.pdf Theorem of the Day has a 'new acquisition': The Remainder Theorem Announce: Theorem no. 154 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/CombinatorialTheory/TripartiteTuran/TotDTripartiteTuran.pdf Theorem of the Day has a 'new acquisition': a Tripartite Turán Theorem Announce: Theorem no. 155 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/NumberTheory/LectureHall/TotDLectureHall.pdf Theorem of the Day has a 'new acquisition': The Lecture Hall Partition Theorem Announce: Theorem no. 156 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GroupTheory/RSK/TotDRSK.pdf Theorem of the Day has two 'new acquisitions': the Transversal Matroid Theorem and The Albert-Brauer-Hasse-Noether Main Theorem Announce: Theorem nos. 157 and 158 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GroupTheory/Netto/TotDNetto.pdf A colour-free version of Theorem no. 49, Netto's Conjecture, has been added. Update: #1 to Theorem 49 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GroupTheory/Halfn/TotDHalfn.pdf Theorem of the Day has a 'new acquisition': the McIver-Neumann 1/2-n Bound Announce: Theorem nos. 159 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/GeometryAndTrigonometry/4Polytopes/TotD4Polytopes.pdf Theorem of the Day has a 'new acquisition': the Classification of the Archimedean 4-Polytopes Announce: Theorem nos. 160 http://www.theoremoftheday.org/Shop/Calendar10.html A preliminary download version of the 2010 Theorem of the Day calendar is now available. News: preliminary 2010 calendar available http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/LogicAndComputerScience/ZeroKnowledge/TotDZeroKnowledge.pdf Theorem of the Day has a 'new acquisition': Quadratic Nonresidue is Zero-Knowledge Provable Announce: Theorem no. 161 http://myweb.lsbu.ac.uk/~whittyr/MathSci/TheoremOfTheDay/Topology/Heath/TotDHeath.pdf Theorem of the Day has a 'new acquisition': Heath's Finitely Discontinuous Function Theorem Announce: Theorem no. 162 http://www.theoremoftheday.org Theorem of the Day has two 'new acquisitions': The Friendship Theorem and the Diaconis-Holmes-Montgomery Coin Tossing Theorem Announce: Theorem nos. 163 and 164 http://www.theoremoftheday.org/Shop/Calendar10.html The 2010 Theorem of the Day calendar is now available as a free download. News: 2010 calendar available http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Lin McMullin's Theorem Announce: Theorem nos. 165 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Haken;s Unknot Theorem Announce: Theorem no. 166 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': The Lindemann-Weierstrass Theorem Announce: Theorem no. 167 http://www.theoremoftheday.org/Resources/Glossary.htm A small but hopefully growing list of acronyms has been attached to the Glossary page. News: announcing list of acronyms http://www.theoremoftheday.org Theorem of the Day has two 'new acquisitions': The Max-Flow Min-Cut Theorem and Sokal's Theorem on Chromatic Roots Announce: Theorem nos. 168 and 169 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition' to celebrate Pi Day 2010: Machin's Formula Announce: Theorem no. 170 http://www.theoremoftheday.org Theorem of the Day apologises for loss of availability on Friday March 26. This was due to unexpected problems during a domain transfer. Apologies for loss of availability http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': The BEST Theorem Announce: Theorem no. 171 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': The Andrews-Garvan-Dyson Crank Announce: Theorem no. 172 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': The Ramanujan Partition Congruences Announce: Theorem no. 173 http://www.theoremoftheday.org You can now get news of what is happening at theoremoftheday via Twitter: http://www.twitter.com/theoremoftheday News: follow us on Twitter http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': The Cameron--Fon-Der-Flaass IBIS Theorem Announce: Theorem no. 174 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': The Bungers--Lehmer Theorem on Cyclotomic Coefficients Announce: Theorem no. 175 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': The Existence Theorem for Bachelor Latin Squares Announce: Theorem no. 176 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 177, The Heine-Borel Theorem Announce: Theorem no. 177 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 178, Sendov's Conjecture Announce: Theorem no. 178 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 179, the Descartes Circle Theorem Announce: Theorem no. 179 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 180, the Greibach Normal Form Theorem Announce: Theorem no. 180 http://www.theoremoftheday.org From today for the next month Theorem of the Day is proudly hosting the 71st Carnival of Mathematics! News: Carnival of Mathematics http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 181, the Archimedes' Equiareal Map Theorem Announce: Theorem no. 181 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 182, the Girard-Newton Identities Announce: Theorem no. 182 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 183, Theorema Egregium. This marks half a leap year of theorems! Announce: Theorem no. 183 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 184, von Neumann's Minimax Theorem Announce: Theorem no. 184 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 185, Konig's Bipartite Matching Theorem Announce: Theorem no. 185 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 186, The Insolvability of the Entscheidungsproblem Announce: Theorem no. 186 http://www.theoremoftheday.org New on my home page: alphabetical theorem listing by keyword; now you can find all 5 theorems with 'partition' in the title instantly! News: alphabetical theorem list http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 187, Karp's Theorem (Detail) Announce: Theorem no. 187 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 188, al-Kashi's Law of Cosines Announce: Theorem no. 188 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 189, The Handshaking Lemma Announce: Theorem no. 189 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 190, Jackson's Theorem on Compatible Euler Tours Announce: Theorem no. 190 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 191, L'Hospital's Rule Announce: Theorem no. 191 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 192, the Rotation Distance Bound Announce: Theorem no. 192 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 193, Frieze's Theorem on Expected Minimum Tree Length Announce: Theorem no. 193 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 194, Wilson's Theorem Announce: Theorem no. 194 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 195, the Erdos-Ko-Rado Theorem Announce: Theorem no. 195 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 196, the Cantor-Bernstein-Schroeder Theorem Announce: Theorem no. 196 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 197, the Robin-Lagarias Theorem Announce: Theorem no. 197 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 198, the Art Gallery Theorem Announce: Theorem no. 198 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 199, Fermat's Two-Squares Theorem Announce: Theorem no. 199 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 200, Minkowski's Convex Body Theorem Announce: Theorem no. 200 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 201, Jensen's Inequality Announce: Theorem no. 201 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 202, the Friedlander-Iwaniec Theorem Announce: Theorem no. 202 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition' to celebrate Tau Day: Theorem no. 203, Euler's Continued Fraction Correspondence Announce: Theorem no. 203 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 204, Singmaster's Binomial Multiplicity Bound (a 'theorem under construction'!) Announce: Theorem no. 204 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 205, The Classification of the Semiregular Tilings Announce: Theorem no. 205 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 206, Euler's Formula Announce: Theorem no. 206 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 207, the Eratosthenes-Legendre Sieve Announce: Theorem no. 207 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 208, Torricelli's Trumpet Announce: Theorem no. 208 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 209, The Erdos Discrepancy Conjecture Announce: Theorem no. 209 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 210, The Basel Problem Announce: Theorem no. 210 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 211, Willans' Formula Announce: Theorem no. 211 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 212, Vizing's Theorem Announce: Theorem no. 212 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 213, The Six Circles Theorem Announce: Theorem no. 213 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 214, a Theorem on Maximal Sum-free Sets in Groups Announce: Theorem no. 214 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 215, Wedderburn's Little Theorem Announce: Theorem no. 215 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorem no. 216, Irrationality of Unit Circle Circumference and Theorem no. 217, Taylor's Theorem Announce: Theorem nos. 216 and 217 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorem no. 218, Riemann Rearrangement Theorem no. 219, Integration by Parts, and Theorem no. 220, the Pappus-Guldin Theorems Announce: Theorem nos. 218, 219 and 220 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisitions': Theorem no. 221, the Inclusion-Exclusion Principle Announce: Theorem no. 221 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisitions': Theorem no. 222, Faulhaber's Formula Announce: Theorem no. 222 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorem no. 223, 224, 225, by Tutte, Green and Regiomontanus Announce: Theorem nos. 223-5 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisitions': Theorem no. 226, Wolstenholme's Theorem Announce: Theorem no. 226 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisitions': Theorem no. 227, Cauchy's Theorem in Group Theory Announce: Theorem no. 227 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorem no. 228, 229, 230, by R.A. Fisher, Poncelet and Ore Announce: Theorem nos. 228-230 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorem no. 231, 232, 233, 234 Announce: Theorem nos. 231-234 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorem no. 235, 236, 237 Announce: Theorem nos. 235-237 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorem no. 238 and 239 Announce: Theorem nos. 238,239 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorem no. 240 and 241 Announce: Theorem nos. 240,241 http://www.theoremoftheday.org Theorem of the Day has a 'new acquisition': Theorem no. 242, the Polya-Redfield Enumeration Theorem Announce: Theorem no. 242 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorems no. 243-246 Announce: Theorem nos. 243-246 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorems no. 247-248 Announce: Theorem nos. 247-248 http://www.theoremoftheday.org Theorem of the Day has 'new acquisitions': Theorems no. 249-251 Announce: Theorem nos. 249-251