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Mathematics
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Adrian
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question
37
Are there rigorous formulation and proof of the pigeonhole principle?
Dec 28, 2014
question
31
Proving that $\arctan(x)+\arctan(1/x)=\pm \pi/2$, could this line of reasoning possibly be correct?
Sep 11, 2015
question
9
Olympic number theory problem: is this solution fine and sufficiently well written?
Jan 31, 2015
question
5
Proof that an infinite subset of $\mathbb{N}$ is countable [duplicate]
Apr 18, 2015
question
4
Is this proof correct? Prove that a continuous, periodic and non-constant function has a smallest period
Nov 8, 2016
question
4
The set of algebraic numbers is countable: is this proof correct and well written?
Jun 2, 2015
question
3
How to solve the two-dimensional Laplace equation in this unbounded and multiply-connected domain?
Oct 18, 2023
question
3
Why were affine spaces defined so?
Sep 11, 2014
answer
3
How to remember trigonometric ratios for allied angles?
Dec 24, 2014
question
3
Showing that $e^{\frac{x}{a}}\simeq \sqrt{\frac{a+x}{a-x}}$
Sep 30, 2016
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20
Electromagnetism problem: where does the magnetic field come from?
15
What did the nobles do after the French Revolution?
15
Proving theorems on one's own: how long should one persist?
14
Do Maxwell's equations imply that still charges produce electrostatic fields and no magnetic fields?
11
Why is the problem of universals a problem?