By: Ardis E. Parshall - August 09, 2016 There is a classic puzzle built around the old geography of Königsberg, Germany (now Kaliningrad, Russia). The city was built along a river with a number of bridges connecting the riverbanks and a large island in the river. The challenge was to devise a path whereby one could walk through the city, crossing every bridge, crossing each bridge only once (and without boating across the river or other...
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