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Jan
22
reviewed Close The Three Subjects
Jan
22
revised Proving $proj_{proj_{\vec u} \vec v} \vec v=proj_{\vec u} \vec v$
added 143 characters in body
Jan
22
awarded  Notable Question
Jan
7
comment Prove that $\frac{a}{\sqrt{a^2+1}}+\frac{b}{\sqrt{b^2+1}}+\frac{c}{\sqrt{c^2+1}} \leq \frac{3}{2}$
What is the meaning of the symbol $\sum_{cyc}$?
Dec
28
revised Prove that $5^n + 2\cdot3^{n-1} + 1$ is multiple of $8$
added 83 characters in body; edited tags
Dec
15
reviewed Approve Find transitive relations
Dec
15
reviewed Reject Proof Check in Algebra
Nov
22
reviewed Close How many integers between $10000$ and $99999$, inclusive, are divisible by $3$ or $5$ or $7?$
Nov
22
reviewed Close Uniformly continuous function bounded by A+bx
Nov
22
reviewed Close Let $A = \{2,3,4\}$ and $B = \{a,b\}$. List elements of $A\times B$.
Nov
22
reviewed Leave Open Prove that $\sqrt[3]5 - \sqrt[4]3$ is Irrational
Nov
22
reviewed Close Evaluate $\int_a^b(x-a)^3(b-x)^4 dx $
Nov
22
reviewed Leave Open Could you find limit without using l'Hôpital?
Nov
22
reviewed Close Set of permutations of $14$ elements in $S_{14}$
Nov
22
reviewed Close Prove if $7\mid a^2+b^2 \longrightarrow 7\mid a$ and $ 7\mid b$
Nov
22
reviewed Close Assume D is bounded and f is uniformly continuous on D. Prove that f(D) bounded
Nov
22
reviewed Close proof that translation of a function converges to function in $L^1$
Nov
19
revised Exists $y \in K$ such that $\|y-x_0\|=\inf\{\|x-x_0\| :x \in K\}$ for disjoint closed sets $K$ and the set of $\{x_0:\|x_0\|≥b\}$
added 3 characters in body; edited title
Nov
19
revised Exists $y \in K$ such that $\|y-x_0\|=\inf\{\|x-x_0\| :x \in K\}$ for disjoint closed sets $K$ and the set of $\{x_0:\|x_0\|≥b\}$
added 3 characters in body; edited title
Nov
11
awarded  Yearling