Abstract:In 1960, a mathematical journal for high school students was founded in the Netherlands, an idea of the Dutch mathematician Hans Freudenthal. Its name: Pythagoras. The first two editors were the mathematicians Gerrit Krooshof and Bruno Ernst, the latter being a personal friend and biographer of the Dutch graphic artist Maurits Escher. The "impossible figures" of Escher have been an ever-recurring subject over the years. In 2011, the editors compiled problems, riddles, games, and articles from fifty years of Py… Show more
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