Reputation
5,812
Next tag badge:
67/100 score
44/20 answers
Badges
3 21 50
Newest
 Necromancer
Impact
~206k people reached

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.