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May
2
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)
May
2
reviewed Approve Is the disjoint union of 2 copies of the complete bipartite graphs vertex transitive?
May
2
reviewed Approve Is the disjoint union of 2 copies of the complete bipartite graphs vertex transitive?
Mar
29
reviewed Close Logical equivalence please help
Mar
24
reviewed Approve Chinese Remainder Theorem for $x\equiv 0 \pmod{y}$
Mar
16
reviewed Approve Book recommendation to prepare for geometry in the International Mathematical Olympiad
Mar
6
reviewed Approve Having trouble understanding why $\sum_{i=1}^ni^2= \frac{n(n+1)(2n+1)}{6}$
Mar
1
reviewed Approve Number Theory Problem
Feb
12
reviewed Approve Basic property of a tensor product
Jan
24
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,
Jan
7
reviewed Approve Number of squares in $(\mathbb{Z}/p\mathbb{Z})^\times$
Jan
7
reviewed Edit Number of squares in $(\mathbb{Z}/p\mathbb{Z})^\times$
Jan
1
reviewed Leave Open Prove: for all $n$ there's a $m$ such that the sum of digits in $mn$ is equal to $n$.
Jan
1
reviewed Leave Open A generalization of arithmetic and geometric means using elementary symmetric polynomials
Dec
20
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)
Dec
14
reviewed Approve Simplifying Permutations
Nov
20
reviewed Approve How many zeros does $f(x)= 3x^4 + x + 2 $ have?
Nov
8
reviewed Approve Proof $(1+1/n)^n$ is an increasing sequence
Nov
2
reviewed Approve How many people play basketball?
Oct
14
reviewed No Action Needed Are fiber products in the category of locally ringed spaces always fiber products in the category of schemes?