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  1. Map of Königsberg in Euler's time showing the actual layout of the seven bridges, highlighting the river Pregel and the bridges. The Seven Bridges of Königsberg is a historically notable problem in mathematics. Its negative resolution by Leonhard Euler in 1736 [1] laid the foundations of graph theory and prefigured the idea of topology.

  2. Conning tower: 100 mm (3.9 in) Königsberg was a German light cruiser that was operated between 1929 and April 1940, including service in World War II. She was the lead vessel of her class and was operated by two German navies, the Reichsmarine and the Kriegsmarine. She had two sister ships, Karlsruhe and Köln.

  3. Battle of Königsberg. Coordinates: 54.7167°N 20.5167°E. Battle of Königsberg. Part of the Eastern Front, East Prussian offensive of World War II. Königsberg defenses and Soviet attack from 6 to 9 April 1945. Date. Late January to 9 April 1945. Final assault: 6–9 April 1945.

  4. Königsberg, Bavaria. /  50.07778°N 10.56667°E  / 50.07778; 10.56667. Königsberg in Bayern is a town in the Haßberge district, in Lower Franconia, Bavaria, Germany. It is situated 7 km (5 miles) northeast of Haßfurt, and 31 km (20 miles) northwest of Bamberg . It was an exclave of Saxe-Coburg and Gotha until 1918, after having been a ...

  5. Königsberg ( németül hivatalosan Königsberg in Preußen, régies magyar nevén Königsberga [1] ), 1946 óta Kalinyingrád, lengyelül Królewiec, litvánul Karaliaučius, latinul Regiomontum a Balti-tenger partjához közel, a Prégel folyó a Friss túrzásba való torkolatánál fekvő egykori porosz, majd német kikötő- és ...

  6. Königsberg fortifications. Dohna Tower, the last to surrender after the Soviet storming of Königsberg in 1945. [1] The fortifications of the former East Prussian capital Königsberg (now Kaliningrad) consist of numerous defensive walls, forts, bastions and other structures. They make up the First and the Second Defensive Belt, built in 1626 ...

  7. Königsberg (region) East Prussian Regierungsbezirk Königsberg (green), as of 1905. Regierungsbezirk Königsberg was a Regierungsbezirk, or government region, of the Prussian province of East Prussia from 1815 until 1945. The regional capital was Königsberg (since 1946, Kaliningrad).