I learned about Apostol&#x27;s death from a post by a very astute mathematical biologist, Lior Pachter, who was once a student of Apostol&#x27;s. The post is &quot;The Ice Cream Cone Proof,&quot;[1] which nicely illustrates Apostol&#x27;s brilliance as a teacher.<p>[1] <a href="https:&#x2F;&#x2F;liorpachter.wordpress.com&#x2F;2016&#x2F;05&#x2F;09&#x2F;the-ice-cream-cone-proof&#x2F;" rel="nofollow">https:&#x2F;&#x2F;liorpachter.wordpress.com&#x2F;2016&#x2F;05&#x2F;09&#x2F;the-ice-cream-c...</a>