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Rasmus's user avatar
Rasmus's user avatar
Rasmus
  • Member for 13 years, 11 months
  • Last seen this week
75 votes
Accepted

Does $G\cong G/H$ imply that $H$ is trivial?

49 votes
Accepted

Prove that $\lfloor0.999\dots\rfloor= ?$ $0$ or $1$?

42 votes

When to learn category theory?

41 votes
Accepted

Is a Fourier transform a change of basis, or is it a linear transformation?

30 votes
Accepted

Function theory: codomain and image, difference between them

29 votes

Tensor product and Kronecker Product

21 votes
Accepted

Is it possible to 'split' coin flipping 3 ways?

20 votes

Are any two open connected subsets of $\Bbb{R}^n$ homeomorphic?

16 votes
Accepted

Flat not projective, projective not free

15 votes

Vivid examples of vector spaces?

14 votes
Accepted

Weierstrass M-Test

14 votes
Accepted

Pseudoinverse matrix and SVD

14 votes

Can spectrum "specify" an operator?

13 votes
Accepted

Is $O$ in $f \in O(g)$ a total partial order on the set of functions?

13 votes
Accepted

What are the sub-sets of a null set?

13 votes
Accepted

Connections between K-Theory and PDEs?

12 votes

Evaluating the integral $\int_0^\infty \frac{\sin x} x \,\mathrm dx = \frac \pi 2$?

11 votes

False beliefs in mathematics (conceptual errors made despite, or because of, mathematical education)

11 votes
Accepted

Operator whose spectrum is given compact set

10 votes

Probability of either dice showing a specific number

10 votes
Accepted

For integers $a$ and $b$, $ab=\text{lcm}(a,b)\cdot\text{hcf}(a,b)$

10 votes
Accepted

How can I prove $\underbrace{\int \ldots \int}_{n} |x| dx = \frac{x^n |x|}{n+1}+C$?

10 votes
Accepted

Is there some universal sense of -ification (eg, groupification) in category theory

10 votes

Why is the 3D case so rich?

10 votes
Accepted

Adding powers of $i$

10 votes

How Do You Actually Do Your Mathematics?

10 votes
Accepted

sigma algebra generated by random variable

10 votes

How to prove if function is increasing

9 votes

Nice examples of groups which are not obviously groups

9 votes

Is Minkowski space not a metric space?

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