The origin of $\int$
54814
What is this symbol $\int$ called?
121071
Calculation of $\int^{\pi/2}_{0}\cos^{n}(x)\cos (nx)\,dx$, where $n\in \mathbb{N}$
133337
A little integration paradox
149910
interpreting triple integrals
21290
Meaning of $\int \phi^\dagger \hat A \psi \:\mathrm dx$
105177
Gosper's unusual formula connecting $e$ and $\pi$
100801
A $\log \Gamma $ identity: Where does it come from?
47096
translation invariant of integral on $\mathbb{R}$
96023
Prove: $\int_\gamma \bar z \, dz=2i\operatorname{Area}(G)$
17620
Why the principal value of complex number argument is taken within $(-\pi,\pi]?$
95943
Dimension analysis of an integral
128572
How $\int_{-\infty}^{\infty}\frac{dx}{1+x^2}$ exists?
67533
A question on integration
84413
Why is $\int_{-\infty}^\infty |g(x)|\,dx = \int_0^\infty \mu(\{x : |g(x)| \ge t\})\,dt$ true?
148576
Origin of rapidly converging sequence for $e^\pi$
18836
Complex integral over a circle
98710
Finding $\int_0^{\infty}xe^{-\lambda x} \, dx$