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# 47 Reviews

 May2 reviewed Approve How many bridge hands have a 5-card suit that must contain the ace of that suit, a 4-card suit, and a void (no cards of a suit) May2 reviewed Approve Is the disjoint union of 2 copies of the complete bipartite graphs vertex transitive? May2 reviewed Approve Is the disjoint union of 2 copies of the complete bipartite graphs vertex transitive? Mar29 reviewed Close Logical equivalence please help Mar24 reviewed Approve Chinese Remainder Theorem for $x\equiv 0 \pmod{y}$ Mar16 reviewed Approve Book recommendation to prepare for geometry in the International Mathematical Olympiad Mar6 reviewed Approve Having trouble understanding why $\sum_{i=1}^ni^2= \frac{n(n+1)(2n+1)}{6}$ Mar1 reviewed Approve Number Theory Problem Feb12 reviewed Approve Basic property of a tensor product Jan24 reviewed Approve $A\subseteq \{1,2,3, \ldots 2000\},$ and for any $a,b\in A,\; |a-b|$ is not equal to 4 or 7, Jan7 reviewed Approve Number of squares in $(\mathbb{Z}/p\mathbb{Z})^\times$ Jan7 reviewed Edit Number of squares in $(\mathbb{Z}/p\mathbb{Z})^\times$ Jan1 reviewed Leave Open Prove: for all $n$ there's a $m$ such that the sum of digits in $mn$ is equal to $n$. Jan1 reviewed Leave Open A generalization of arithmetic and geometric means using elementary symmetric polynomials Dec20 reviewed Leave Open For $E \subset \mathbb{R}$ and $\epsilon >0$, $\exists$ $(a,b)$ s.t. $\theta(E \cap (a,b)) \geq (1-\epsilon)|b-a|$ ($\theta$ Lesbegue Outer Measure) Dec14 reviewed Approve Simplifying Permutations Nov20 reviewed Approve How many zeros does $f(x)= 3x^4 + x + 2$ have? Nov8 reviewed Approve Proof $(1+1/n)^n$ is an increasing sequence Nov2 reviewed Approve How many people play basketball? Oct14 reviewed No Action Needed Are fiber products in the category of locally ringed spaces always fiber products in the category of schemes?