Euler wrote to Giovanni Marinoni, an Italian mathematician and engineer who lived in Vienna and was Court Astronomer in the court of Kaiser Leopold I. The Euler-Marinoni correspondence is of interest in part because it was to Marinoni that Euler first wrote about the famous Konigsberg bridge problem.

This quote was taken from a translation of OO1468 that appeared in an article by Hopkins and Wilson in the College Mathematics Journal (May 2004).

A problem was posed to me about an island in the city of Konigsberg, surrounded by a river spanned by seven bridges, and I was asked whether someone could traverse the separate bridges in a connected walk in such a way that each bridge is crossed only once. I was informed that hitherto no-one had demonstrated the possibility of doing this, or shown that it is impossible. This question is so banal, but seemed to me worthy of attention in that geometry, nor algebra, nor even the art of counting was sufficient to solve it. In view of this, it occurred to me to wonder whether it belonged to the geometry of position [geometriam Situs], which Leibniz had once so much longed for. And so, after some deliberation, I obtained a simple, yet completely established, rule with whose help one can immediately decide for all examples of this kind, with any number of bridges in any arrangement, whether such a round trip is possible, or not . . . |

OO1467 | Marinoni to Euler | 16 December, 1735 |

OO1468 | Euler to Marinoni | 13 March, 1736 |

OO1469 | Marinoni to Euler | 12 September, 1736 |

OO1470 | Euler to Marinoni | 17 November, 1736 |

OO1471 | Marinoni to Euler | undated, 1736 |

OO1472 | Euler to Marinoni | 12 July, 1740 |

OO1473 | Marinoni to Euler | 01 January, 1741 |

OO1474 | Marinoni to Euler | 08 June, 1746 |

OO1475 | Marinoni to Euler | 08 September, 1746 |

OO1476 | Marinoni to Euler | 31 December, 1746 |

OO1477 | Marinoni to Euler | 29 March, 1747 |

OO1478 | Marinoni to Euler | 13 May, 1747 |

OO1479 | Marinoni to Euler | 08 November, 1747 |

OO1480 | Marinoni to Euler | 18 September, 1748 |

OO1481 | Marinoni to Euler | 26 October, 1748 |

OO1482 | Marinoni to Euler | 19 February, 1749 |

OO1483 | Euler to Marinoni | 15 March, 1749 |

OO1484 | Marinoni to Euler | 11 June, 1749 |

OO1485 | Marinoni to Euler | 28 July, 1749 |

OO1486 | Marinoni to Euler | 12 November, 1749 |

OO1487 | Marinoni to Euler | 03 January, 1750 |

OO1488 | Marinoni to Euler | 31 August, 1751 |

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