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2d
awarded  Taxonomist
Feb
6
comment Write $\gamma(t) = (t,t^2,t^3)$ as a graph and a level set
@diffGeoLost A level set of a function $f$ is a set points where $f=c$ for some constant $c$
Jan
2
comment Does $\sum_{n=1}^\infty \frac{2\cdot 4\cdot 6\cdot …\cdot (2n)}{n^n}$ converge?
I think it is easy to use ratio test
Dec
31
reviewed Leave Open Differential of determinant of metric tensor
Dec
31
comment Let $f(x)$ be a differentiable function on real number line such that $\lim_{x\to \infty} f(x) = 1$ and $\lim_{x\to \infty} f'(x) = a$
The asymptote line to $f(x)$ is $y=1$ and the slope of this line is $0$.
Dec
31
comment confusion about permutation
your mistake is that 72 includes 8, so you subtract 8 twice
Dec
31
revised confusion about permutation
added 5 characters in body
Dec
31
comment confusion about permutation
Could you please write what you did
Dec
21
comment Generalization of integrating factor?
@yhhuang Excellent
Dec
21
comment Generalization of integrating factor?
Did you try to evaluate and use it for $n=2$?
Dec
20
awarded  Yearling
Dec
18
comment Compute using the define of Lie derivative.
@lanse7pty Could you please add the book information(name, author, page)
Apr
18
answered $\frac{d^2y}{dt^2}+4y=t\sin(2t)$'s particular solution
Mar
15
comment Is there a charaterization of riemannian product manifolds?
@RyanBudney Thank you.
Mar
15
comment Is there a charaterization of riemannian product manifolds?
Thank you for your interesting answer.
Mar
15
accepted Is there a charaterization of riemannian product manifolds?
Mar
11
asked Is there a charaterization of riemannian product manifolds?
Feb
10
comment Find the surface area obtained by rotating $y=1+3x^2$ from $x=0$ to $x=2$ about the y-axis.
Yes you are right
Feb
2
awarded  Benefactor
Feb
2
comment Hessian of a function on Riemannian manifolds
your answer is still the best incomplete one