TED-ED: How the K_nigsberg bridge problem changed mathematics - Dan Van der Vieren

The video explores the famous mathematical problem of the seven bridges of Konigsberg, a city divided by the Pregel River with two islands connected by seven bridges. Carl Ehler's curiosity about crossing all bridges without repetition led him to seek help from Leonhard Euler. Euler initially dismissed the problem but later developed graph theory to solve it. He discovered that a path crossing each bridge once is impossible due to the odd degree of nodes. Euler's work laid the foundation for graph theory, explaining Eulerian paths and circuits. The video also touches on historical events that altered Konigsberg, now Kaliningrad, and the lasting impact of this mathematical riddle.

Describe the two scenarios in which a Eulerian path is possible according to Euler's theory.

What historical event inadvertently created a Eulerian path in Konigsberg?