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Answers
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4
A set for which it is hard to determine whether or not it is countable.
11
Irreducible representation flipping two elements
1
Rank of sum of Galois conjugates of a matrix
3
How many elements does it take to normally generate a group?
4
Superfluous definitions
2
Isomorphism of semidirect products
11
Signatures on the infinite symmetric group
8
Does any research mathematics involve solving functional equations?
20
Hard Cube Puzzle
2
Sphere packing in a sphere
2
Semi-simple matrices over fields of finite characteristic
11
Non-split extensions of $GL_n(F_q)$ by $F_q^n$ ?
0
Can the I-fold direct product be free?
5
More open problems
11
How many finite simple groups of order $p+1$?
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Why are this operator’s primes the Sophie Germain primes?
10
Is there any way to check whether a group is residually solvable?
3
does this group have a name?
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Can a problem be simultaneously polynomial time and undecidable?
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Integers in a triangle, and differences