Leonhard Euler 1707 - Some of his formulae. I'm quite fond of the Euler-MacLaurin summation formula (last one) as I 'rediscovered it independently' in order to solve a challenge by a friend.

What makes an equation beautiful? by physicsworld. (Mathhombre) Miscellanea : My work always tried to unite the true with the beautiful, but when I had to chooseâ€¦ I usually chose the beautiful.