darij grinberg's user avatar
darij grinberg's user avatar
darij grinberg's user avatar
darij grinberg
  • Member for 14 years, 3 months
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2 votes
Accepted

An equalizer in commutative algebras

3 votes
Accepted

Is the "renormalized third comultiplication" on $\mathbf{Symm}$ integral?

8 votes
Accepted

A basis for Schur functors

1 vote

L a finite-dimensional complex semisimple lie algebra, then ad(L)=Der(L).

10 votes
Accepted

Basic question about affine group schemes

2 votes

Reference for representations of quaternion group

2 votes

$\lambda$-ring structure defined for a graded ring in Fulton–Lang's book

3 votes

Discrete Mathematics textbooks for undergraduates

8 votes

A mysterious Heisenberg algebra identity from Sylvester, 1867

6 votes

College (Euclidean) geometry textbook recommendations

3 votes
Accepted

Is decomposition of a representation of a group G over a vector space V into irreducible subrepresentations over invariant subspaces of V unique?

0 votes

An isomorphism of 2-Schur modules

1 vote
Accepted

Grading a non-graded poset as squeezed as possible

2 votes

Blackbox Theorems

8 votes

Blackbox Theorems

2 votes
Accepted

Connected graded involutive bialgebras (Hopf algebras) sought (for Dynkin idempotent checking)

0 votes

Math demonstration about friendship between students (not a good title :D)

9 votes

An $n!\times n!$ determinant

2 votes

Noether's bound for anticommutative invariant theory (diff. forms instead of polynomials)?

4 votes

Constructing new polynomials by product of roots

6 votes
Accepted

Clifford PBW theorem for quadratic form

28 votes

Nice proofs of the Poincaré–Birkhoff–Witt theorem

15 votes
Accepted

What is a pointed Hopf algebra?

21 votes
Accepted

Symmetric polynoms are Hopf algebra ? What for one needs co-product ?

7 votes
Accepted

Conjecture: "Neretin polynomials" for a normalized Schwarzian have integer coefficients

11 votes
Accepted

Decomposition of positive definite matrices.

12 votes
Accepted

a type of numbers resulting from the partitions of an integer

3 votes
Accepted

A proof in Lang - Algebraic number theory

4 votes

Short Course Suggestions For High School Students

8 votes

Contest problems with connections to deeper mathematics

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