"Hacking and painting have a lot in common. In fact, of all the different types of people I've known, hackers and painters are among the most alike..."
" The greatest damage that photography has done to painting may be the fact that it killed the best day job. Most of the great painters in history supported themselves by painting portraits."
"The following is a list of some common proof techniques that
are often extremely useful. I received the original list long time ago
via e-mail. Recently Christophe de Dinechin, Dan Echlin, Alex Papanicolao,
Arnold G. Reinhold, Greg Rose, Lucas Scharenbroich, Moritz Voss, David
N. Werner and Thomas Zaslavsky suggested some additions. I also added
my own experiences from teaching techniques of proofs in a first year
mathematics units for several years.
Unfortunately all these proof techniques are invalid and, hence, one should not use them in assignments, workshops, exams, papers, etc. "