Biography: Leonhard Euler

Ptolemy's table of chords: Implications considered and discussed

“…; there he lays the foundations of modern mathematical analysis (c.f. Finkel, 1897;Walter, 1982;Koyama & Kurokawa, 2005;Calinger, 2016).…”

Leonhard Euler: A brief appreciation

“…Equally remarkable was Euler's memory (both visual and aural): he knew all of Virgil's Aeneid by heart, and was able to recite the first and last line of every page of the edition he had studied as a youth [32,44]. He was also known to precisely remember the minutes of the Academy meetings years after they were held.…”

“…The first appearance of e in a published work of Euler was in his 1736 book Mechanica [50, p. 157]. The choice of e may have been short for exponential or simply the first available vowel after a [32]. The symbol π had been used in the mid-1600s to denote the periphery of a circle.…”

“…As stated in [6, p. 151], "Even on the creative side, Euler combined instruction with discovery." Also, he was quite willing to write a primer that summarized the key points of a much larger advanced work on a more elementary level [6,32]. Euler even produced works on elementary mathematics for Russian schools.…”