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Taladris
  • Member for 11 years, 3 months
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101 votes
4 answers
21k views

Why did no student correctly find a pair of $2\times 2$ matrices with the same determinant and trace that are not similar?

35 votes
5 answers
2k views

Total distance traveled when visiting all rational numbers

32 votes
5 answers
4k views

Why is "mathematical induction" called "mathematical"?

18 votes
1 answer
3k views

Arithmetic and geometric sequences: where does their name come from?

15 votes
1 answer
1k views

How did Vladimir Voevodsky "changed the meaning of the equals sign"?

15 votes
2 answers
1k views

Can we recover the adjacency matrix of a graph from its square?

11 votes
2 answers
495 views

Indefinite integral. Where is the mistake?

10 votes
1 answer
2k views

Simplicial homology of the skeleton of a simplex

8 votes
1 answer
163 views

Where to place 10 guards in a 17-walled art gallery such that removal of any one leaves the gallery unprotected?

7 votes
1 answer
3k views

Is there a strategy to win this "move color" game?

7 votes
2 answers
208 views

What can be said about the set of points that makes the MVT "works"?

7 votes
3 answers
530 views

Nice embedding of the permutohedron of order $n$ in ${\mathbb R}^{n-1}$

7 votes
1 answer
363 views

Why do we care about planar graphs?

6 votes
4 answers
894 views

Geometric proof that $\int_a^c (x-a)(x-b)(x-c)\ dx=0$ if and only if $b$ is the midpoint of $a$ and $c$.

6 votes
2 answers
1k views

Piecewise linear function and absolute value

6 votes
2 answers
362 views

Interval of convergence of $\sum\limits_{n\geq0} \binom{2n}{n} x^n$

6 votes
2 answers
4k views

Intuitive idea behind the probability density function

6 votes
1 answer
486 views

Can we prove that an odd degree real polynomial has a root from Descartes' Rule of Signs?

5 votes
2 answers
146 views

Non analytic numbers

5 votes
0 answers
411 views

Examples of good phone interview quetions.

5 votes
1 answer
1k views

Converse of the Fundamental Theorem of Calculus

5 votes
1 answer
4k views

L'Hospital's rule vs Taylor series

5 votes
2 answers
547 views

How to recover the cohomology of a torus from its description of a quotient

4 votes
1 answer
293 views

Exterior powers of vector space and kernel

4 votes
1 answer
107 views

Counter-example to $\int_0^\infty f(x) dx=\lim_{t\to\infty} \int_{1/t}^t f(x) dx$

4 votes
6 answers
4k views

Logic and set theory textbook for high school

4 votes
0 answers
568 views

Upper bound for area of polygons

4 votes
2 answers
628 views

Prove or disprove: For $2\times 2$ matrices $A$ and $B$, if $(AB)^2=0$, then $(BA)^2=0$.

4 votes
1 answer
468 views

Counter-example for integration by parts with improper integrals

4 votes
1 answer
96 views

Are there invertible functions such that $f=\frac{g}{h}$ and $f^{-1}=\frac{g^{-1}}{h^{-1}}$?