Mathematics
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Hagen von Eitzen
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I did study math and had a knack for it, but I am sooo out of that business now ...

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309 How can a piece of A4 paper be folded in exactly three equal parts? Apr 2 '14
194 Why is empty set an open set? Jul 19 '13
166 Can you be 1/12th Cherokee? Jan 18 '15
107 Connected metric spaces with disjoint open balls Sep 13 '12
97 Why do people lose in chess? Jul 7 '14
95 What exactly are eigen-things? Feb 11 '13
90 How do I convince my students that the choice of variable of integration is irrelevant? Jan 21 '14
82 Can two figures have the same area, perimeter, and same number of segments have different shape? Jul 25 '19
73 How can one prove that $e<\pi$? Sep 10 '13
72 How to prove that a $3 \times 3$ Magic Square must have $5$ in its middle cell? Jan 13 '14
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