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Jan
2
accepted Using Lagrange's diagonalization on degenerate linear forms
Dec
29
accepted Any transformation that commutes with a transformation commuting with $S$ must be a polynomial in $S$
Dec
25
accepted Linear transformations preserve the squared sum of norms of orthonormal bases
Dec
22
accepted All the ternary n-words with an even sum of digits and a zero.
Dec
20
accepted All the binary n-words without the sequence 011
Dec
5
accepted Finding the function of the power series $\sum\limits _{n=1}^{\infty}\frac{x^{2n+1}}{n}$
Nov
28
accepted Proving differentiability on every interval equals proving differentiability on all of $\mathbb{R}$?
Nov
26
accepted If $\lim\limits _{x\to\infty}\left(\log f\right)'\left(x\right)$ is negative, then $\int_{0}^{\infty}f\left(x\right)dx $ converges?
Nov
19
accepted Powers of linear transformation and minimal polynomial
Nov
8
accepted If $H<G$ is of finite index, and for some $x\in G$, $xHx^{-1}\subset H$, prove that $xHx^{-1}=H$
Oct
23
accepted Integrating $\frac{\ln{ax}}{x\ln{bx}}$
Oct
23
accepted How many integers satisfy the condition?
Jul
23
accepted Fundamental Theorem of Calculus and the left endpoint of the interval.
Jul
9
accepted A negative third derivative implies a positive first derivative at a point.
Jun
29
accepted Proving that $\ln ^3|x|=x$ has exactly 3 real solutions
Jun
9
accepted Using second derivative to find a bound for the first derivative
Jun
7
accepted Proving the inequality $2^{-1+\frac{1}{n}}\left(x+1\right)\leq\left(x^{n}+1\right)^{\frac{1}{n}}$ for $n\in\mathbb{N} $ and $x>0$
Jun
6
accepted Proving the ranges of repeated iteration of a one-to-one function from $X$ to a subset are disjoint
Jun
5
accepted Determinant of matrix with trigonometric functions
May
26
accepted Limit of $\frac{f\left(x+g\left(x\right)\right)-f\left(g\left(x\right)\right)}{x}$ as $x\to 0$