User xskxzr

xskxzr

Member for 7 years, 11 months
Last seen more than a month ago

中国

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A Ghost on the Internet

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Jul 30, 2020
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Apr 28

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Mar 26, 2020
Explainer

Jul 17, 2019
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Apr 4, 2018

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number-theory

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square-numbers

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real-analysis

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combinatorics

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calculus

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elementary-number-theory

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How to prove there exist two elements in a positive integer sequence with bounded differences such that one is a multiple of the other?

Nov 4, 2015

If $x+y^3,x^2+y^2,x^3+y$ are all integers, are $x,y$ both integers?

Apr 25, 2020

Does there exist a positive integer $k$ such that $A = 2 ^ k + 3 ^ k$ is a square number?

Mar 25, 2018

Lower bound for the square root sum of the roots of $x - \ln x - m$

Mar 19, 2020

Is there a closed form for $\sup_{f,0\le x\le 1}(1-x)f(x)/\int_0^1f(t)\,\mathrm{d}t$?

Apr 12, 2019

Can I compute the limit using $\lim_{x \to 0}e^x -1 =x$?

Mar 31, 2018

Count permutation pairs such that for each element, either permutation gives it a different position from its original position

Mar 23, 2020

Does $\sin n$ have a maximum value for natural number $n$?

Oct 15, 2015

Can edge-connectivity version of Menger's theorem be generalized for two subsets of vertices?

Mar 27, 2018

Equivalence of uniform continuity and a relaxation of Cauchy continuity

Apr 30, 2018