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AlbertH earned this badge 3 times |
apr 28 at 16:36
Prove that $\sqrt{a}\leq\frac{1+a}{2}$
nov 8 at 4:46
Prove that $\int_0^1|f''(x)|dx\ge4.$
jul 5 '11 at 17:47
The “XX XX” polyomino
