Nicol

Member for 9 years, 1 month
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elementary-number-theory

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34

Are there rigorous formulation and proof of the pigeonhole principle?

Dec 28, 2014

32

Proving that $\arctan(x)+\arctan(1/x)=\pm \pi/2$, could this line of reasoning possibly be correct?

Sep 11, 2015

9

Olympic number theory problem: is this solution fine and sufficiently well written?

Jan 31, 2015

5

Proof that an infinite subset of $\mathbb{N}$ is countable

Apr 18, 2015

4

The set of algebraic numbers is countable: is this proof correct and well written?

Jun 2, 2015

Answers

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3

How to remember trigonometric ratios for allied angles?

Dec 24, 2014

1

$x=yx$. Can this statement be true when we don't know that $y=1$?

Jan 23, 2015

1

Prove that $(n^2-1)\mid(n^3+1)$ iff $n=2$

Feb 3, 2015

0

Technique for proving four given points to be concyclic?

Sep 19, 2016

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trigonometry

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elementary-number-theory

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algebra-precalculus

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divisibility

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induction

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