Rick's Random Interesting Things in Maths - Menu

This is a random selection of mathematical facts, ideas or related observations. They have nothing in common except that they all appeal to me. The occasional bit may be original. If you spot any errors please do let me know.

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All the roots of all polynomials of degree less than or equal to 5 with integer coefficients ranging from -4 to 4 (Dan Christensen, 2006)