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38 Answers

Newest Activity Votes
11
The Riemann Sphere Interpretation
Aug 19 '15 at 20:14
10
Galois group of a palindromic polynomial is not $S_n$?
Jun 24 '16 at 6:25
10
What are some good introductory books on mathematical proofs?
Jan 29 '14 at 3:56
8
Finite group representation on endomorphism ring
Jun 24 '16 at 16:06
7
Euclidean space as a sum of non-intersecting and non-parrarel lines
Jan 22 '14 at 23:56
6
A Field Extension of a Cyclic Galois Group is Galois
Aug 22 '15 at 18:02
5
Is there a cute proof of (Hausdorff space iff diagonal closed)?
Aug 19 '15 at 19:10
5
if $g^k=e$ then $\chi(g)=\sum_j^n \zeta_k$
Jan 21 '14 at 9:01
3
Fermat primality test $\gcd$ condition and carmichael numbers
Aug 23 '15 at 6:31
3
Prove: If $f: X \subset \mathbb{R}^n \rightarrow Y$ has a continuous extension to all $\mathbb{R}^n$ then $f_\ast$ is trivial.
Aug 22 '15 at 18:15
3
Question of maps in Mayer-Vietoris sequence
Aug 21 '15 at 23:52
3
Maximal ideals and the projective Nullstellensatz
Aug 20 '15 at 19:41
3
Structure theorem for finitely generated modules over PID applied to an abelian group of order $10$.
Aug 19 '15 at 21:37
3
can you consider a series to be a sequence of sums?
Aug 19 '15 at 19:47
3
Notation for quotient ring
Jan 21 '14 at 10:04
3
number of irreps quotient by a nontrivial normal subgroup.
Jan 21 '14 at 9:55
3
When does a sum converge?
Jan 21 '14 at 8:23
2
infinite dimensional hilbert space - uniqueness of series expansion
Aug 23 '15 at 4:52
2
'Proof' of the correspondence between maximal ideals and points in projective space
Aug 22 '15 at 8:57
2
Find trace of linear operator
Aug 21 '15 at 7:00
2
What is the Indefinite Integral of $f(x)=x^x$?
Aug 21 '15 at 7:48
2
The cardinality of elliptic curves over finite field
Aug 20 '15 at 20:00
2
Is the intersection of an infinite family of subspaces of $V$ itself a subspace of $V$?
Aug 19 '15 at 20:46
2
Permutation as product of inversions
Aug 19 '15 at 19:29
2
What explicitly is the “adjunction” isomorphism $Hom_C(A,C)\to Hom_B(A,Hom_C(B,C))$?
Aug 19 '15 at 1:46
2
Domain of holomorphy: finding a holomorphic function.
Aug 19 '15 at 0:52
2
Is $A_{S}$ a ring of fractions or a localized ring?
Jan 24 '14 at 9:58
2
Let $U,V$ be subspaces of the vector space $W$. Show that if $U\nsubseteq V$ and $V\nsubseteq U$ then $U \cup V$ is not a subspace.
Jan 24 '14 at 9:42
2
Union of two countable sets
Jan 22 '14 at 2:11
2
Reference request: Behavior of power series at endpoints
Jan 21 '14 at 8:49
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