Tobias Kildetoft

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120 Answers

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20
If $x^3 =x$ then $6x=0$ in a ring
18
Why is $\sqrt{4} = 2$ and Not $\pm 2$?
17
Why do we define quotient groups for normal subgroups only?
14
how to find all groups that have exactly 3 subgroups?
14
Create unique number from 2 numbers
13
Difference between bijection and isomorphism?
10
If $G$ has only 2 proper, non-trivial subgroups then $G$ is cyclic
10
All subgroup are Normal
9
Nice examples of groups which are not obviously groups
7
May a group have two disjoint subgroups?
7
Finitely generated algebra
7
If a finite group $G$ is solvable, is $[G,G]$ nilpotent?
7
kernel maximal ideal
7
Can you explain the “Axiom of choice” in simple terms?
6
Rings with zero divisors
6
What does the plus sign contained in a circle ($\oplus$) mean in this case?
6
When does a polynomial in $GF$ have a multiplicative inverse?
6
subgroup of order $11$ lies inside $Z(G).$
6
Centralizer of a finite normal subgroup has finite index
5
Why can't you flatten a sphere?
5
Action of $\mathfrak{sl}({V})$ in tensor spaces
5
Group as a product of subgroups
4
A question on the category of sets
4
Notations for one-sided coset spaces
4
What is symmetric about the symmetric group?
4
Division rings arising from the endomorphism ring of a simple module
4
Generalization of index 2 subgroups are normal
4
Is it true that if $\mathrm{Aut}(G)$ is nilpotent then $G$ is also nilpotent?
4
proof for members of ideals
4
Is the product of square singular and non singular matrices always singular?
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