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May
24
comment An example of a group such that $G \cong G \times G$
Oh. It's displayed wrong in the mobile site
May
24
comment An example of a group such that $G \cong G \times G$
I don't understand.. If H is finite for example it's not true
May
22
revised Group under addition structure of a finite field of order 9
added 5 characters in body
May
21
answered Group under addition structure of a finite field of order 9
May
9
comment Homomorphisms and Groups proof
@danny $f(b^{2})=f(b\cdot b)=f(b)\cdot f(b)=f^{2}(b)$ . Now use induction
May
8
answered Order of a group calculation
May
4
awarded  Good Question
May
3
comment Do you know Legendre's conjecture ? Has it been proved?
Can't you just take epsilon to be small enough such that the difference between the expression with the exponent of 2 and the one with exponent of 2 plus epsilon is less then 1? If the claim holds for every positive epsilon this reasoning should show it holds for epsilon equals zero
May
2
accepted No normal subgroup of a subgroup of $S_n$ imply the subgroup is the one of even permutations or consists of two elements
May
2
asked No normal subgroup of a subgroup of $S_n$ imply the subgroup is the one of even permutations or consists of two elements
May
2
comment Why is the zero polynomial not assigned a degree?
Increasing in what variable ?
May
2
comment Why is the zero polynomial not assigned a degree?
what about $+\infty$ ?
May
2
answered Prove that $L_7$ is a subgroup of $S_7$
May
2
answered sylow p-subgroups of S3, S4 and S5
May
2
accepted If $G$ acts non-trivially on a set then it has a proper normal subgroup of finite index
May
2
revised If $G$ acts non-trivially on a set then it has a proper normal subgroup of finite index
added 7 characters in body
May
2
asked If $G$ acts non-trivially on a set then it has a proper normal subgroup of finite index
May
1
accepted Eigenvalues of $I-A^{t}A$ where $A$ is a semi orthogonal matrix
May
1
answered Is the intersection between a subgroup, and a normal subgroup, normal in the parent group?
May
1
revised Is the intersection between a subgroup, and a normal subgroup, normal in the parent group?
edited tags