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Recreational mathematics or puzzles with serious mathematical content. Note that math contest problems are generally considered off-topic.

31 votes

cube + cube + cube = cube

The solution mentioned in the question consists in fact of $9$ pieces, as shown in the following picture I took yesterday. I don't know whether a solution with $8$ pieces exists.
François Brunault's user avatar
38 votes
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What is this subgroup of $\mathfrak S_{12}$?

The invariance group of the solutions set can be given a geometric interpretation as follows. Note that $\mathfrak{S}_4 \times \frac{\mathbf{Z}}{2\mathbf{Z}}$ is none other than the group of isometrie …
François Brunault's user avatar