The Kind Cat
Reputation
38,975
97/100 score
 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.