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Re:Caltech Professor Emeritus, Author Tom M. Apostol, Dies a... by tokenadult on Wednesday May 11, 2016 @05:22PM (#11679423)
I learned about Apostol's death from a post by a very astute mathematical biologist, Lior Pachter, who was once a student of Apostol's. The post is "The Ice Cream Cone Proof,"[1] which nicely illustrates Apostol's brilliance as a teacher.

[1] https://liorpachter.wordpress.com/2016/05/09/the-ice-cream-c...

Re:Caltech Professor Emeritus, Author Tom M. Apostol, Dies a... by abecedarius on Wednesday May 11, 2016 @11:31PM (#11681140)
I'm sad; I had him for the same course Pachter describes. One time he lectured on the prime number theorem, just for entertainment: he didn't prove it, but got deep enough to rather blow me away.

Here's a more recent elementary talk of his: http://www.its.caltech.edu/~mamikon/VisualCalc.html