(追記) (追記ここまで)
Improper Integral
A definite integral for which the integrand has a discontinuity between the bounds of integration, or which has ∞ and/or –∞ as a bound. Improper integrals are evaluated using limits as shown below. If the limit exists and is finite, we say the integral converges. If the limit does not exist or is infinite, we say the integral diverges.
See also