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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
Nov
2
comment Extended version of Mean-Value Theorem, lower bound result and reference request.
@DanielFischer This is a counter example ? If $f (x, y) = e^x (\cos y, \sin y)$ then there not exists $m> 0$ and $M> 0$ such that $m<\|Df(x)\|_{\mathscr{L}(\mathbb{R}^2,\mathbb{R}^2)}<M$ because $\inf_{(x,y)}\|Df(x)\|_{\mathscr{L}(\mathbb{R},\mathbb{R}^m)}=0$ and $0<\|Df(x,y)\|_{\mathscr{L}(\mathbb{R}^2,\mathbb{R}^2)}<e^x$.
Nov
2
revised Extended version of Mean-Value Theorem, lower bound result and reference request.
added 126 characters in body
Nov
2
revised Extended version of Mean-Value Theorem, lower bound result and reference request.
added 18 characters in body
Nov
2
asked Extended version of Mean-Value Theorem, lower bound result and reference request.
Oct
31
revised If $\lim_{x\to0} f(x)+g(x)$ and $\lim_{x\to0} f(x)g(x)$ exist simultaneously, are there any $f(x)$ and $g(x)$ that do not have limit
added 164 characters in body
Oct
31
revised If $\lim_{x\to0} f(x)+g(x)$ and $\lim_{x\to0} f(x)g(x)$ exist simultaneously, are there any $f(x)$ and $g(x)$ that do not have limit
improved formatting
Oct
31
revised Can't argue with success? Looking for “bad math” that “gets away with it”
added 20 characters in body