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soft question - Visually stunning math concepts which are easy to explain - Mathematics Stack Exchange
[https://math.stackexchange.com/questions/733754/visually-stunning-math-concepts-which-are-easy-to-explain] - - public:xxx
taskbook_arnold_en_0.pdf - Problems for children from 5 to 15
[https://www.imaginary.org/sites/default/files/taskbook_arnold_en_0.pdf] - - public:xxx
Math riddles