Elias

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An expert is a man who has made all the mistakes, which can be made, in a very narrow field. (Niels Bohr)

	3,003 reputation	bio	website		visits	member for	1 year, 6 months
524 badges		location			seen	7 hours ago

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May 2	answered	Without a calculator, behavior of$ f(x) = e^{(2x-x^2)}$. What does the concavity tell me?
May 2	revised	Algorithm to calculate multiple integral. edited tags
Apr 20	revised	How can I prove that $xy\leq x^2+y^2$? added 8 characters in body
Apr 20	revised	Triangle inequality: $\vert\vert a+b\vert^q-\vert a\vert^q\vert\leq \varepsilon\vert a\vert^q+C(\varepsilon)\vert b\vert^q$ edited body
Apr 14	comment	Fast way to calculate determinant for a block matrix @mezhang Feel free to correct any errors.
Apr 14	revised	Fast way to calculate determinant for a block matrix added 6 characters in body
Apr 13	revised	$\frac{1}{1-x}$ series expansion deleted 237 characters in body
Apr 13	comment	How do you find the limit of $\frac{4x^4 + 5y^4}{x^2 + y^2}$? But its construction is very good. The justifications just saw that can be fitted perfectly in the middle of his solution.
Apr 13	comment	How do you find the limit of $\frac{4x^4 + 5y^4}{x^2 + y^2}$? You need to justify some passages to limit their operations here.
Apr 13	answered	$\frac{1}{1-x}$ series expansion
Apr 12	comment	Matrix Representation of Operators in Infinite Dimensional (Separable) Hilbert Spaces @julien I corrected my little mistake in my answer.
Apr 12	revised	Matrix Representation of Operators in Infinite Dimensional (Separable) Hilbert Spaces edited body
Apr 12	revised	Is my understanding of the Supremum correct? added 300 characters in body
Apr 12	answered	Is my understanding of the Supremum correct?
Apr 11	comment	How can the proof of a local theorem on a manifold involving a map with a fixed point and a differential be reduced to the case of $\mathbb{R}^n$? You could also use the application exponential (and the fact that it identifies not closed geodesics and geodesic lines and identifies with closed circles). But your solution is much simpler.
Apr 11	comment	What is the real life use of hyperbola? @Inceptio Nice answer! (+1)
Apr 11	revised	Matrix Representation of Operators in Infinite Dimensional (Separable) Hilbert Spaces added 258 characters in body
Apr 11	answered	Matrix Representation of Operators in Infinite Dimensional (Separable) Hilbert Spaces
Apr 11	comment	Suppose $f(x)$ is such that $\int_{-\infty}^\infty e^{tx} f(x)dx = \arcsin (t - \sqrt{1/2})$ Remember that $\int_{-\infty}^{+\infty}=\lim_{u\to -\infty}\int_{u}^{x}+\lim_{v\to +\infty}\int^{v}_{x}$ for all $x$
Apr 11	answered	Suppose $f(x)$ is such that $\int_{-\infty}^\infty e^{tx} f(x)dx = \arcsin (t - \sqrt{1/2})$