\intThe integral symbol \int is used to denote the operation of integration in calculus. It represents the accumulation of quantities, such as areas under a curve, and is a fundamental concept in mathematical analysis.
Definite integral of function f(x) from a to b
\int_a^b f(x) \, dxIndefinite integral of function f(x)
\int f(x) \, dxImproper integral of the exponential function from 0 to infinity
\int_0^\infty e^{-x} \, dx