How the Königsberg bridge problem changed mathematics

@z.slxer on Instagram: "Leonard Euler, born on April 15, 1707, in Basel, Switzerland, was a brilliant Swiss mathematician and physicist who transformed science despite losing his eyesight in his thirties. He produced over 800 papers on calculus, graph theory, mechanics, optics, and astronomy, introducing notations like π, 0) and solving the Basel problem, he founded graph theory with the Seven Bridges of Königsberg. Euler worked in Saint Petersburg, Russia, until his death on September 18, 1783,