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30 If we define $\sin x$ as series, how can we obtain the geometric meaning of $\sin x$? Mar 28 '12
21 how to strictly prove $\sin x<x$ for $0<x<\frac{\pi}{2}$ Mar 28 '12
11 give a counterexample of monoid Apr 17 '12
10 Prove at least two are not relatively prime, for any $8$ composite positive integers not exceeding $360$ Mar 22 '17
9 If a linear map $T$ has a $k$-dimensional invariant subspace, does it admit an $n-k$ invariant subspace? Mar 29 '17
7 Semiring between measure theory and abstract algebra Sep 11 '12
6 Prove $\sum_1^{\infty} a_i^2$ convergent Dec 9 '16
5 what is inverse limit in this polynomial ring? Feb 18 '20
5 Finding $\alpha$ for $\sin(4 \alpha + \frac{\pi}{6}) = \sin (2\alpha + \frac{\pi}{5})$ Sep 13 '12
4 Some function with intermediate value property is continuous. Dec 24 '17
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