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SeraPhim
  • Member for 4 years, 9 months
  • Last seen this week
  • Leicester, UK
6 votes
Accepted

A where-from and how-to study pure mathematics question

6 votes

Are there "tri-commutative" structures for which: $AB \neq BA$, $BC \neq CB$, yet $ABC = BAC = ACB$?

4 votes
Accepted

"Basic" coalgebra structures on $R$-modules

3 votes
Accepted

Understanding the $\alpha$ existence in the definition of the boundary map in case of simplicial homology and its absence in singular homology.

3 votes

Reference Request: $H^1(\mathfrak g, V)=0$ for semisimple Lie algebra $\mathfrak g$ and $\mathfrak g$-module $V$

2 votes
Accepted

Validity of a definition of continuity/discontinuity

2 votes
Accepted

Let $x$, $y$ $\in$ $\mathbb{R}$, find all the complex numbers $z=a+bi$ satisfying $|z+x|$ $= y$

2 votes

Cyclic cohomology

2 votes

To show a subset of $\Bbb{Q}$ isn't a subring

2 votes

How should someone remember theorems?

1 vote
Accepted

How does the natural topology work for $\mathbb{R}^2$?

1 vote

Finding general formula for a recursion function

1 vote
Accepted

Cyclic cohomology of a field $k$

1 vote

How to prove that $\frac{\cosh (2 \pi x)}{x^2}$ is convex?

1 vote
Accepted

Prove that $(\bigcup\mathcal F)\setminus(\bigcup\mathcal G)\subseteq\bigcup(\mathcal F\setminus\mathcal G).$

1 vote

If $g''(x) = x(x+2)(x-3)^2$, then the graph of $g$ has inflection points when is equal to what $x$?

1 vote
Accepted

Prove $f^{-1}[⋂_iB_i]=⋂_if^{−1}[B_i]$

1 vote
Accepted

Action of the centre on Hochschild cohomology

0 votes

Meaning of $(\mathfrak q :x)$ in ring theory (commutative algebra)

0 votes

Intuition behind the fundamental group $\pi_1(S^1)$

0 votes

Proving directional derivative identities

0 votes

Tensor product of quadratic number field with itself

0 votes
Accepted

How helpful is learning Python to mathematicians?

0 votes
Accepted

Show that if $[m]_7 = [n]_7$, then $[3m]_7 = [3n]_7$ for all $m,n \in \mathbb{Z}.$