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Non-rigorous reasoning in rigorous mathematics
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Covering a unit ball with balls half the radius (2)
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Does every ellipse inside a tetrahedron inside a ball fit in a triangle inside the ball?
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Another colored balls puzzle (part II)
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Counting restricted polyominoes
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A curious sequence of rationals: finite or infinite?
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Path length of ball on tilted, perforated plane
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Area of union of random circles in a plane