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by Science Photo Library
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Our greeting cards are 5" x 7" in size and are produced on digital offset printers using 100 lb. paper stock. Each card is coated with a UV protectant on the outside surface which produces a semi-gloss finish. The inside of each card has a matte white finish and can be customized with your own message up to 500 characters in length. Each card comes with a white envelope for mailing or gift giving.
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Seven Bridges of Koenigsberg. This historical puzzle is based on the city of Koenigsberg in what was then Prussia (it is now Kaliningrad in Russia).... more
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Seven Bridges of Koenigsberg. This historical puzzle is based on the city of Koenigsberg in what was then Prussia (it is now Kaliningrad in Russia). Seven bridges over the Pregel River connected the two sides of the city and two islands in the river. The problem posed in the early 16th century was to find a single route that crossed each bridge only once. This problem was the subject of a 1735 paper by the Swiss mathematician Leonhard Euler (1707-1783), who showed that it was not possible to find such a route. This problem is an example of graph theory and modern topology, which both developed from Euler's pioneering work.
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