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Jan
22
accepted If $G$ is a direct product of simple groups, then is every simple subgroup of $G$ isomorphic to a subgroup of some factor?
Jan
18
accepted Maximizing the sum of the products of endpoints of edges in a graph
Jan
5
accepted Metric space with two similar points which are not in the same orbit.
Jan
1
accepted For what values of $k$ does $(1+x)^{500+k}(1-x)^{500-k}$ exceed $10^9$?
Dec
11
accepted Proving $A_5$ is the smallest perfect group.
Nov
3
accepted Composition of category equivalence and limit creating functor preserves limit
Nov
2
accepted If $A$ and $B$ are summands of injective module $Q$ then $A+B$ is a sumand of $Q$.
Nov
1
accepted Proving $\Bbb Z_p$ has no projective cover.
Nov
1
accepted If $P$ is projective and $A,B$ are direct summands of $P$ then $A\cap B$ is a direct summand of $P$
Sep
27
accepted Prove these two elements are not associated in $\mathbb Q[x,y,z]/(x-xyz)$
Sep
23
accepted Cayley's theorem as a particular case of Yoneda's Lemma. Is my work correct?
Sep
2
accepted Number of divisors $d$ of $n^2$ so that $d\nmid n$ and $d>n$
Aug
31
accepted If $|H|=112$ then $A_7\cap H \lhd H$?
Aug
27
accepted Sum of three cross products is zero.
Aug
26
accepted a matrix of rank $r$ satisfies a polynomial of degree $r+1$.
Aug
20
accepted Tzaloa 2015 game problem (piles with $1,2,4 \dots 2^{19}$ coins each)
Aug
19
accepted Slick proof that if an open set contains $\mathbb Q$ it has all irrational numbers, except a countable amount.
Aug
13
accepted What is the maximum area two non intersecting circles can cover if they are contained in a unit square?
Aug
13
accepted Can three diagonals in a $2k+1$-gon intersect?
Aug
12
accepted Proof a Rng cannot have exactly five non-zero divisors.