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orangeskid
  • Member for 10 years, 9 months
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"Syllogismus ex propositionibus constat, propositiones ex verbis, verba notionum tesserae sunt. Itaque si notiones ipsae (id quod basis rei est) confusae sint, et temere a rebus abstractae; nihil in iis, quae superstruuntur, est firmitudinis. Itaque spes est una in inductione vera."

(Francis Bacon, APHORISMI DE INTERPRETATIONE NATURAE ET REGNO HOMINIS. XIV)

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question
12
Commuting hermitian matrices
Oct 4, 2017
question
11
Convexity of a certain sublevel set
Aug 1, 2014
question
10
Inverse Galois problem for $2$-groups with an involution as complex conjugation
Apr 15, 2018
answer
10
How to prove the determinant of a Hilbert-like matrix with parameter is non-zero
Apr 23, 2020
question
6
Changing values of digits of an algebraic irrational number
Oct 12, 2017
question
5
Subsequence of a sequence of digits of an algebraic irrational number
Oct 16, 2017
answer
3
What's a nice argument that shows the volume of the unit ball in $\mathbb R^n$ approaches 0?
Dec 20, 2022
answer
2
Must a map on a compact space be surjective on $\cap_{n=1}^\infty f^n(X)$?
Oct 7, 2014
answer
2
Vitali sets of full outer measure
Nov 4, 2020
answer
2
Why the sequence of Bernstein polynomials of $\sqrt x$ is increasing?
May 30, 2022
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178
Is there a size of rectangle that retains its ratio when it's folded in half?
27
Assume that we have six positive real numbers whose sum is 150. Prove that there exist two of them whose difference is less than 10.
23
How to compute $\int_{-\infty}^\infty\exp\left(-\frac{(x^2-13x-1)^2}{611x^2}\right)\ dx$
20
Why is log-of-sum-of-exponentials $f(x)=\log\left(\sum_{i=1}^n e^ {x_i}\right)$ a convex function for $x \in\mathbb R^n$?
18
Maclaurin series of $1- \cos^{2/3} x$ has all coefficients positive