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Bugs Bunny
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11 votes
1 answer
1k views

Existence of skeletons in ZFC

9 votes
1 answer
317 views

$\lambda$-ring endomorphisms of ${\mathbb Z}[x]$

3 votes
0 answers
100 views

Finite dimensional real division algebra up to isotopy

50 votes
4 answers
22k views

When is $L^2(X)$ separable?

4 votes
1 answer
736 views

How to compute Homotopy Pullback

14 votes
0 answers
835 views

Cardinality of the set of continuous functions

4 votes
0 answers
140 views

Do comodules form an exact category?

3 votes
0 answers
42 views

Preradicals generating a radical

61 votes
13 answers
8k views

Example of an unnatural isomorphism

11 votes
1 answer
357 views

The Locus of Complete Intersection Points

5 votes
1 answer
794 views

Are there enough meromorphic functions on a compact analytic manifold?

4 votes
0 answers
242 views

Second symmetric square of the adjoint representation

5 votes
1 answer
967 views

When is the image of a regular map an algebraic variety?

17 votes
6 answers
5k views

What is a good book on topological groups?

2 votes
1 answer
63 views

Nontrivial primitivity of full matrix ring

4 votes
0 answers
273 views

First Fundamental Theorem for Alternating Group

15 votes
5 answers
6k views

Sheaves without global sections

8 votes
2 answers
716 views

Irreducible representations of simple complex groups

15 votes
2 answers
766 views

Invariants and orbits of $n$-tensors

11 votes
0 answers
275 views

Greedy permutation of the set $\{1,2,\dots,n\}$ and prime numbers

9 votes
1 answer
2k views

Projectives and Injectives in Functor Categories

4 votes
0 answers
151 views

Nilpotent orbits and subspaces

17 votes
0 answers
586 views

Bunnity of multilinear maps

3 votes
1 answer
2k views

What are Santilli's isonumbers?

9 votes
1 answer
940 views

Saavedra's Definition of Tannakian Category

7 votes
2 answers
653 views

$n$-path-connected components of a variety

13 votes
4 answers
5k views

What is the universal enveloping algebra?

9 votes
3 answers
745 views

How can I tell whether a manifold is homogeneous?

9 votes
1 answer
550 views

Unitary Representations of $GL_2({\mathbb Q}_p)$

11 votes
3 answers
2k views

What is a (generalized) BN-pair?