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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.
Jan
29
revised Single reference to classical results in analysis.
added 63 characters in body
Jan
29
comment Single reference to classical results in analysis.
@David, I repaired the question.
Jan
29
revised Single reference to classical results in analysis.
eliminating small misconceptions and improving the question.
Jan
27
reviewed Close Subgroup of $S_4$ of order 4
Jan
27
revised Dual program is wrong. Authors claim is right.
added 337 characters in body; edited tags
Jan
27
revised Single reference to classical results in analysis.
edited body
Jan
27
comment Single reference to classical results in analysis.
@JohnSteinbeck $D\subset \mathbb{Y}$.