noun
improper integral
A mathematical term for an integral where the interval of integration is unbounded or the integrand has a singularity.
広義積分の収束条件を調べる。
Investigate the convergence condition of the improper integral.
定積分 is a definite integral over a finite interval with a bounded integrand, while 広義積分 extends the concept to unbounded intervals or singularities.
Compound of 広義 (broad sense) and 積分 (integral), a calque from English 'improper integral'.