improper integral
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limit of a definite integral with as one or both limits approach infinity or values at which the integrand is undefined
~25 min read
Encyclopedic overview
An improper Riemann integral of the first kind, where the region in the plane implied by the integral is infinite in extent horizontally. The area of such a region, which the integral represents, may be finite (as here) or infinite. An improper Riemann integral of the second kind, where the implied region is infinite vertically. The region may have either finite (as here) or infinite area.
Integral
Excerpted from Wikipedia’s “improper integral” article, available under the CC BY-SA 4.0 licence.