Saturday, 29 November 2014

How many melodies are there?


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Five Martin Gardner eye-openers involving squares and cubes


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Monday, 17 November 2014

The Bicycle Pulling Puzzle


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Curved and Straight


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Define f:R→R by \[f(x)= \begin{cases}(1-\cos x) \sin \left(\frac{1}{x}\right), & x \neq 0 \ 0, ...