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Ben Derrett earned this badge 3 times
dec 27 '11 at 10:15
If every open set is a countable union of balls, is the space separable?
sep 20 '11 at 5:26
If $f:\mathbb{R}\to\mathbb{R}$ is a left continuous function can the set of discontinuous points of $f$ have positive Lebesgue measure?
apr 26 '11 at 3:39
How to calculate the matrix exponential explicitly for a matrix which isn't diagonalizable?

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