Expression for the sigma function in terms of $d^2$.
10920
$\delta_2(n)$ the sum of the squares of the positive divisors of $n$.
98660
(complex measures) $d\nu=d\lambda +f\,dm \Rightarrow d|\nu|=d|\lambda| +|f|\,dm$ and $f\in L^1(\nu)\Rightarrow f\in L^1(|\nu|)$
96023
Prove: $\int_\gamma \bar z \, dz=2i\operatorname{Area}(G)$
73131
Derivation of the gaussian integral
125465
Proving that $\sum \limits_{d^2|n}\ \mu (d)=\mu^2(n)$, where $\mu$ is the Möbius function.
121661
Evaluating the sum $\Sigma \, \frac{1}{k(k+p)}$
151111
How do I show that $\frac{n}{\varphi(n)}=\sum\limits_{d \mid n} \frac{\mu^2(d)}{\varphi(d)}$?
157599
what is the meaning of $F_\sigma$ and $G_\delta?$
71490
Is there any use for the quantity $\int f(x)^2 dx$ in statistics or information theory?
60944
Evaluating an integral with ${\mathrm{d}t}$ in the numerator, $\int \frac{\mathrm{d}t}{\cos(t)^2}$.
137569
Generalising a Dirac Delta function formula in General Relativity
177
How can I calculate $\int^{\infty}_{-\infty}\Phi\left(\frac{w-a}{b}\right)\phi(w)\,\mathrm dw$
6843
Explain $\iint \mathrm dx\,\mathrm dy = \iint r \,\mathrm \,d\alpha\,\mathrm dr$
45725
Derivation of an identity with beta function.
135713
What does "$(-1/2)_k$" mean in this expression related to incomplete elliptic integrals?
105774
How is $ \cos (\alpha / \beta) $ expressed in terms of $\cos \alpha $ and $ \cos \beta $?
92746
$\Delta \mathbf n = -2 \mathbf n$ on the Euclidean sphere