MathOverview
Reputation
5,812
67/100 score
 Apr 25 revised On the Constant Rank Theorem and the Frobenius Theorem for differential equations. edited body Apr 23 awarded Necromancer Apr 1 revised Show that curvature and torsion are $κ = \frac{\left|γ'∧γ''\right|}{\left|γ'\right|^3}$ and $\tau = \frac{(γ'∧γ'')\cdot γ'''}{\left|γ'∧γ''\right|^2}$ edited title Mar 25 reviewed Close Relation between the Hessian and Laplacian Mar 25 reviewed Close Proof involving conditional expectation Mar 25 reviewed Close Is it possible to calculate $\sin(\alpha)$ (and other trigonometric functions) as a rational number? Mar 25 reviewed Close Proving $f\colon S \to S$; $f(x) = 1/x$ is bijective Mar 25 reviewed Close Which book or website do you recommend for self-learning calculus? Mar 25 reviewed Approve show that the image of the unit ball under $T$ is not compact. Mar 25 revised If $f_1, f_2, f_3,\ldots$ is the Fibonacci sequence proof $f_1^2 + f_2^ 2 + \cdots + f_n^2 = f_n f_{n+1}$. edited title Mar 22 asked On the alternative stamentes of the famous Sperner's Lemma. Mar 16 revised Prove $\sum_{i=0}^{n}\left(x_{i}^{n}\prod_{0\leq k\leq n}^{k\neq i}\frac{x-x_k}{x_i-x_k}\right)=x^n$ added 23 characters in body Mar 14 reviewed Looks OK General form for a $3\times 3$ orthogonal projection Mar 14 revised Calculating $\lim_{n\to\infty}\sum_{k=1}^{\infty}\frac{(-1)^{k}\arctan(n^{2}k)}{n^{\alpha}+k^{3/2}}$ edited tags Mar 7 awarded real-analysis Mar 7 revised Why the $\nabla f(x)$ in the direction orthogonal to $f(x)$? edited tags Feb 27 reviewed No Action Needed Property of log-concave function Jan 29 comment Single reference to classical results in analysis. @David, now believe that there are no problems in the theorem. Thanks for the comment. Jan 29 revised Single reference to classical results in analysis. added 267 characters in body Jan 29 revised how to prove $(-1)\cdot(-1)=1$ based only on the field axioms? I simplified the demonstration.