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Mar
27
comment Why gradient vector is perpendicular to the plane
See this question and may answer: math.stackexchange.com/questions/401845/…
Mar
27
awarded  Fanatic
Mar
26
reviewed Approve How can I find out the center of mass of thin plate in the shape of a rectangle?
Mar
22
reviewed Leave Open Arxiv - what should I expect
Mar
22
reviewed Close High School Students Publishing Mathematics
Mar
22
reviewed Close What makes Probability so difficult to get it right in the first place?
Mar
22
reviewed Close Need advice. How relearn what Ive forgotten?
Mar
22
reviewed Close Ray line intersection question
Mar
22
reviewed Close Intuition - Divisibility results - If c divides some integers, then c divides any linear combination of them.
Mar
22
reviewed Close What languages to learn for maths?
Mar
22
reviewed Close easy activity to train finding pattern ability?
Mar
22
revised Interchanging supremum and integral (another question)
improviment on LaTeX codes.
Mar
18
comment When a function contains a sequence, and how to find the function's limit?
@ElleryLai Do not intend to exhaust all cases to be analyzed. In the case of home work, is not purpose of this site provide full answers.
Mar
18
comment When a function contains a sequence, and how to find the function's limit?
@Ellery If $\lim_{n\to \infty}\frac{n}{x\cdot a_n}=L\neq 0$ and $L\in\mathbb{R}$ then the question is trivial. In your secont coment you are right. I hope helped you.
Mar
18
answered When a function contains a sequence, and how to find the function's limit?
Mar
14
reviewed Close About a norm : $p(uv)=p(u)p(v)$ all the time?
Mar
14
reviewed Close $E[x_i^2 x_j^2]$ for white Gaussian noise
Mar
14
reviewed Reject puzzle tag wiki excerpt
Mar
12
revised Proof of Banach's homeomorphism theorem without the contraction map principle.
added 12 characters in body
Mar
12
comment Proof of Banach's homeomorphism theorem without the contraction map principle.
@UmbertoP. Yes. There is. But speaking in terms of mathematics fundamentals I do not believe that such a test would find walking through results that were independent of Banach's fixed point theorem or domain invariance theorem. I think I could proof that uses connectness. I am writing a review about the implicit function theorem. Indeed an alternative proof that does not use the Banach's fixed point theorem.