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  2. Seven Bridges of Königsberg - Wikipedia

    en.wikipedia.org/wiki/Seven_Bridges_of_Königsberg

    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] The city of Königsberg in Prussia (now Kaliningrad, Russia) was set on both sides of the Pregel River, and included two large ...

  3. Königsberg - Wikipedia

    en.wikipedia.org/wiki/Königsberg

    Königsberg (/ ˈ k ɜː n ɪ ɡ z b ɜːr ɡ /; German: [ˈkøːnɪçsbɛʁk] ⓘ; lit. ' King's mountain '; Polish: Królewiec; Lithuanian: Karaliaučius; Baltic Prussian: Kunnegsgarbs; Russian: Кёнигсберг, romanized: Kyónigsberg, IPA: [ˈkʲɵnʲɪɡzbʲɪrk]) is the historic German and Prussian name of the medieval city that is now Kaliningrad, Russia.

  4. Five-room puzzle - Wikipedia

    en.wikipedia.org/wiki/Five-room_puzzle

    Bottom: A solution on a torus — the dotted line is on the back side of the torus Comparison of the graphs of the Seven bridges of Konigsberg (top) and Five-room puzzles (bottom). The numbers denote the number of edges connected to each vertex.

  5. File:Comparison 7 bridges of Konigsberg 5 room puzzle graphs ...

    en.wikipedia.org/wiki/File:Comparison_7_bridges...

    comparison 7 bridges of Konigsberg 5 room puzzle graphs: Image title: Comparison of the graphs of the Seven bridges of Konigsberg (top) and Five-room puzzle (bottom) by CMG Lee. The numbers denote the number of edges connected to each node. Nodes with an odd number of edges are shaded orange. Width: 100%: Height: 100%

  6. Timeline of Kaliningrad - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_Kaliningrad

    1735 – Math problem "Seven Bridges of Königsberg" presented. 1736 26 January: Stanisław Leszczyński signed an act of renunciation of the Polish crown in the city. [25] 27 March: Stanisław Leszczyński left the city for France on March 27, 1736. [25] 1756 – Synagogue built. 1758 14 January: Forces of the Kingdom of Prussia withdraw from ...

  7. List of impossible puzzles - Wikipedia

    en.wikipedia.org/wiki/List_of_impossible_puzzles

    Seven Bridges of Königsberg – Walk through a city while crossing each of seven bridges exactly once. [6] Squaring the circle, the impossible problem of constructing a square with the same area as a given circle, using only a compass and straightedge. [7]

  8. Carl Gottlieb Ehler - Wikipedia

    en.wikipedia.org/wiki/Carl_Gottlieb_Ehler

    The correspondence itself is lost, but we can find the main thread of their relationship with Euler's first letter of response. In the letter, Euler talks of the problem of the Seven Bridges of Königsberg, a problem that Ehler brought to Euler's attention. The reason for such an inquiry was the desire by Kuhn and Ehler to encourage ...

  9. Kneiphof - Wikipedia

    en.wikipedia.org/wiki/Kneiphof

    Bridges connecting Kneiphof to Altstadt were the Krämerbrücke (built 1286), the Dombrücke (built ca. 1330, destroyed 1379), and the Schmiedebrücke (built 1379). The Honigbrücke (built 1542) connected Kneiphof to Lomse , while the town was connected with Vorstadt by the Grüne Brücke (built 1322) and the Köttelbrücke (built 1377).