"Pages from The Book"
Short, perfect proofs
that are:
- high-tech, and
- not well-known
These should be part of the *cannon* (canon?) of math:
every mathematician should know 'em.

State the theorem, give the proof,
and no details.
For details, refer to bigger write-ups.

There are also well-known great proofs:
- Euclid's proof of infinitude of primes
etc.
(See "guide-book" for more)