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user253963
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$|\sin\phi_{n}(x)| = \sqrt{\frac{1}{2} - \dfrac{1}{2[1+ (\omega_{n}a(x))^{2}]^{1/2}}}$
Sep 27, 2022
4
$Au_{xx} + Bu = 0 $ then $u = 0$
Mar 2, 2023
3
For all $a,b \in \mathbb{R}$ and $k > 0$ : $(a+b)^{2} \geq \dfrac{a^{2}}{1+k} - \dfrac{b^{2}}{k} $
Sep 10, 2022
2
Exercise 4 - Serge Lang - Chapter XIX
May 2, 2022
2
$ S = \left\lbrace\frac{m\sqrt{n}}{p} - 2\pi n^{3/2}p\,, \;n \in \mathbb{N}\,, m \in \mathbb{Z}\right\rbrace$ is an enumerable set.
May 25, 2023
2
Determine the $2023$th derivative of $f(x) = \sqrt{x}$.
May 17, 2023
2
Kepler’s First Law - Differential Equations, Dynamical Systems, and an Introduction to Chaos
Jun 16, 2022
2
How to pass partial derivatives with respect to t to the integral - Heat Equation in $\mathbb{R}^{n}$
Jun 20, 2022
2
$C_{1}f(x) \leq g(x) \leq C_{2}f(x)$ where $f,g $ be continuous and positive functions
Oct 20, 2022
2
Check a problem solution $au + (b + i\lambda)u_{xx} = 0$ with boundary conditions.
Mar 4, 2023
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Exercise 8.13 - Brezis