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Is ABC an equilateral triangle
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Min of $\frac{a^{10}+ b^{10}}{a^{7}+ b^{7}} +\frac{b^{10}+ c^{10}}{b^{7}+ c^{7}} +\frac{c^{10}+ a^{10}}{c^{7}+ a^{7}} $
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Find the range of $f(x) =(x1)^{1/2} + 2\cdot(3x)^{1/2}$
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Proving the combinatorial identity ${n \choose k} = {n2\choose k2} + 2{n2\choose k1} + {n2\choose k}$
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If $(b,n)=1$, $n\mid(adbc)$ and $n\mid(ab)$ then $n\mid (cd)$.
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If $\sum b_n < L$ and $b_n \to 0$, then it converges?
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Is it an integer for all positive integer n ?
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Isomorphic simple groups
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