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 Oct26 reviewed Close Prove that $\sum_{i=1}^na_i\sum_{i=1}^na^{-1}_i\ge n^2$ and $\sum_{i=1}^na_i^2\ge\frac1n$ Oct26 reviewed Close How can I prove that $\sup(\bigcup_{i \in I} A_{i}) =\sup\{\sup \,A_{i} : i \in I \}$? Oct26 reviewed Close Find $\lim_{n \to \infty} (0,9999+\frac{1}{\sqrt{n}})^n$ and $\lim_{n \to \infty} (1,00001-\frac{1}{n})^n$ Oct26 reviewed Close Limit of the reciprocal of the mean harmonic Oct24 comment Normal distribution tail probability inequality nice and easy... Oct24 comment Normal distribution tail probability inequality so your approach is valid for $t\geq \sqrt{\pi/2}$. i do not know how to do it, so maybe, you start by assuming otherwise. Oct24 reviewed No Action Needed Normal distribution tail probability inequality Oct24 reviewed Approve process of $(a,b)R(c,d)\implies a\cdot b(b+c)=bc\cdot (a+d)$ being transistive relation.. Oct17 reviewed Close $\dfrac1a+\dfrac1b=\dfrac1c$, $a, b, c \in \mathbb{N}$ with no common factor, find all solutions Oct17 reviewed Close Why is the reduced echelon form of a set of independent vectors, the identity matrix? Oct17 reviewed Close In what base does the equation $x^2 - 11x + 22 = 0$ have solutions $6$ and $3$? Oct17 reviewed Close Simple Combination Help! Oct17 reviewed Close Math homework, so much guessing work? Oct17 reviewed Close Stopping Time and Brownian Motion Oct17 reviewed Approve Simplify: $\sin \frac{2\pi}{n} +\sin \frac{4\pi}{n} +\ldots +\sin \frac{2\pi(n-1)}{n}$. Oct16 reviewed Close Integrate $\csc(x)^3dx$ Oct16 reviewed Close Evaluate $\int_0^\infty \cos(x)/\cosh(x) dx$ Oct16 awarded Yearling Oct14 revised Why is the canonical filtration of a Brownian motion left-continuous? edited title Oct9 reviewed Approve Is this one bounded?