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 Mar27 comment Why gradient vector is perpendicular to the plane See this question and may answer: math.stackexchange.com/questions/401845/… Mar27 awarded Fanatic Mar26 reviewed Approve How can I find out the center of mass of thin plate in the shape of a rectangle? Mar22 reviewed Leave Open Arxiv - what should I expect Mar22 reviewed Close High School Students Publishing Mathematics Mar22 reviewed Close What makes Probability so difficult to get it right in the first place? Mar22 reviewed Close Need advice. How relearn what Ive forgotten? Mar22 reviewed Close Ray line intersection question Mar22 reviewed Close Intuition - Divisibility results - If c divides some integers, then c divides any linear combination of them. Mar22 reviewed Close What languages to learn for maths? Mar22 reviewed Close easy activity to train finding pattern ability? Mar22 revised Interchanging supremum and integral (another question) improviment on LaTeX codes. Mar18 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. Mar18 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. Mar18 answered When a function contains a sequence, and how to find the function's limit? Mar14 reviewed Close About a norm : $p(uv)=p(u)p(v)$ all the time? Mar14 reviewed Close $E[x_i^2 x_j^2]$ for white Gaussian noise Mar14 reviewed Reject puzzle tag wiki excerpt Mar12 revised Proof of Banach's homeomorphism theorem without the contraction map principle. added 12 characters in body Mar12 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.