Math students can never escape the watchful gaze of Leonhard Euler! That's right - the Swiss mathematician who haunts every corner of advanced math like Spider-Man patrols New York. Calculus homework? Euler's there. Number theory? Euler's constant is watching. Trying to solve a topology problem at 2AM? BAM! Euler's formula jumps out of nowhere!
The man contributed to practically EVERY field of mathematics - from graph theory to infinitesimal calculus. His legacy is so massive that mathematicians literally can't turn around without bumping into another one of his 500+ theorems or identities. No wonder they see his face everywhere... he basically invented half of modern math!