Reputation
12,531
Top tag
Next privilege 15,000 Rep.
Protect questions
Badges
3 23 49
Newest
 Good Answer
Impact
~158k people reached

May
15
reviewed Close $\leq$ V.S. $\leqslant$
May
15
reviewed Close expectation value of 2 dependent events
May
15
reviewed Close (Help) Find integers x <17 and y < 17 that satisfy: 2x + y ≡ 4 (mod17) 5x−5y ≡ 9 (mod17)
May
9
reviewed No Action Needed etale morphism between sheaves
May
9
reviewed Close Prove or disprove the following statements
May
9
reviewed Close How can you solve $x^2+2x^{-1}-1=0$?
May
9
reviewed Looks OK Diffeomorphism ( differential geometry)
May
5
reviewed Close A problem about real analysis
Apr
10
reviewed No Action Needed Prove the function $f:\Bbb C^{*} \rightarrow \Bbb R^+$ given by $f(a+bi)=\sqrt{a^2+b^2}$ is a homomorphism and describe its kernel.
Apr
7
reviewed Approve Parametric differentiation
Apr
7
awarded  Good Answer
Mar
26
reviewed Approve Why is the number of conjugacy classes modulo 16 equal to the order for a finite group of odd order?
Mar
26
reviewed Leave Open How can $0!=1$ if the definition of factorial is $n!=n\times (n-1)!$
Mar
26
reviewed Leave Open One drunk receptionist and four brilliant mathematicians
Mar
26
reviewed Leave Open How many function satisfy $f(x)=f^{-1}(x)$ if the $f(x)$ have only have one subtraction operation and one division operation?
Mar
25
reviewed Close Angles inequality in acute triangle
Mar
25
revised How to start proof of triangular inequality?
deleted 564 characters in body; edited tags
Mar
25
reviewed Leave Open Subspace of metrizable and separable space is separable
Mar
25
answered How to calculate $\lim_{k \to \infty} \frac{(2k)!}{(2k+2)!}$
Mar
24
comment Why is the Riemann curvature tensor the technical expression of curvature?
May I ask you which textbook you are talking about?