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11h
accepted Solving the IVP given by $\dot x=\frac{t-x}{t+x}$ and $x(0)=1$
16h
accepted Gaussian integral $\int_{-\infty}^\infty \exp(-(x+\mathrm iY)^2)\,\mathrm d x$ along $[-R,R]+\mathrm i[0,Y]$
20h
accepted Why does $z\mapsto \exp(-z^2)$ have an antiderivative on $\mathbb C$?
1d
accepted Probability space for zebras and their number of stripes
1d
accepted Show that a power series is analytic inside its radius of convergence
Apr
17
accepted Exact differential equation $f(t,x)+g(t,x)\dot x=0$ and constants
Apr
16
accepted When is $\sin\colon\mathbb{C}\to\mathbb{C}$ purely real/imaginary?
Apr
9
accepted Issues computing $\int\cos^2x~\mathrm{d}x$ without using $\sin^2(x)=1-\cos^2(x)$
Apr
9
accepted Simplify $(n+1)^{1/\sqrt{n}}$ and $(n^2+1)^{1/n}$
Mar
24
accepted Show $\sum_{k=1}^\infty \frac{k^2}{k!} = 2\mathrm{e}$
Feb
12
accepted Deducing the series expansion of $\arctan(x^2)$ via the series expansion of $\arctan(x)$ at $x=0$
Jan
27
accepted Multivariable taylor series expansion of $\exp(-(x^2+y^2))$
Jan
22
accepted Eigenvectors of $\begin{pmatrix}6&2\\-10&-1\end{pmatrix}$ (linear equations with complex numbers)
Dec
15
accepted ELI5: What are pointwise and uniform convergence and what is the difference?
Dec
9
accepted Show that $\int_1^\infty \frac{\ln x}{\left(1+x^2\right)^\lambda}\mathrm dx$ is convergent only for $\lambda > \frac{1}{2}$
Nov
27
accepted Throwing the dice - wrong interpretation still yields correct result
Nov
22
accepted Reconstructing a function from its critical points and inflection points
Nov
17
accepted Show that $\exp(x)-1=\mathcal{O}(x)$ for $x\to 0$
Nov
12
accepted Show that $\sqrt{x}$ is continuous using sequences
Nov
3
accepted Prove that $x_{n+1}=\frac{x_n}{2}+\frac{1}{x_n}\geq\sqrt{2}$