Integral test for Series

preview_player
Показать описание
Consider an integer N and a non-negative function f defined on the unbounded interval [N, ∞), on which it is monotone decreasing. Then the infinite series
\sum_{n=N}^\infty f(n)
converges to a real number if and only if the improper integral
\int_N^\infty f(x)\,dx
is finite. In other words, if the integral diverges, then the series diverges as well.
Рекомендации по теме
Комментарии
Автор

Really clear exposition, thank you Chris!

matthewspillane
Автор

i am really gratefull for these beneficail tutorials, what if the integral was included between 0 and +infinity ?!

alehejazi
Автор

Hi Dr T
The sound quality became a bit distorted at times during this video; what name did you give for these series, It sounded a bit like Percival Series? 

Perryscope
Автор

What can't you take the integral test of ?

KiwiNom