**Theorem of the Day**

**Theorem Under Construction**: a theorem whose importance seems
to be that it has opened up a new field of research with a clear but not-yet-attained
goal. With luck such a theorem description will be dynamic, charting progress
towards an eventual victory; until then it records a beautiful, challenging
and provocative piece of mathematics.

** Theorem Under Construction**: a theorem which no longer appears to me to qualify under the terms of the preceding paragraph.