Those attempting a mathematical pilgrimage to Kaliningrad’s Seven Bridges will be sorely disappointed. Two bridges were destroyed by bombing at the end of the Second World War, two more were demolished and replaced by a Soviet highway. Of the other three originals, one other had been rebuilt in 1935. So of the remaining five, only two date from Euler’s time. Ironically, this reduced number of bridges now does make an Eulerian path possible…
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