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Apr
10
reviewed Close Write a word problem from the following inequality equations.
Apr
10
reviewed Reviewed Show that linear transformation is invertible
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 Finding the volume of a solid of revolution
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 Reviewed How to evaluate $\int\frac{x^2}{3+2x^3}dx$?
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?
Mar
24
reviewed Approve Chinese Remainder Theorem for $x\equiv 0 \pmod{y}$
Mar
24
comment Using Schwarz Lemma to find an upper bound for $f'(0)$
I think you should have $|h'(f(0))||f'(0)|\leq 1$ by chain rule.
Mar
15
reviewed No Action Needed Trivial tangent bundle of manifolds with boundary
Mar
12
reviewed Looks OK Series $\frac{1}{4}+\frac{1\cdot 3}{4\cdot 6}+\frac{1\cdot 3\cdot 5}{4\cdot 6\cdot 8}+\cdots$