Infinite series (4)

**Miss** · March 6th 2010, 02:36 PM

Originally Posted by NonCommAlg

you should know that the convergence of $\int^{\infty} f(x) \ dx$ doesn't necessarily imply that $\sum^{\infty} f(n)$ is convergent. for example $\int_0^{\infty} \sin x^2 \ dx=\sqrt{\frac{\pi}{8}}$ but the series $\sum_{n=0}^{\infty} \sin n^2$ is divergent.

Ohh.
But the integral test said that "if and only if".
Maybe it implies the convergence only when function is positive,continuous and decreasing. Right?

**Krizalid** · March 6th 2010, 04:19 PM

when i read the "maybe," then yes.

**Miss** · March 11th 2010, 06:03 AM

Originally Posted by Krizalid

when i read the "maybe," then yes.

Sorry, but your reply did not make any sense.
Is true or not ?
forget that "maybe".

**Krizalid** · March 11th 2010, 06:15 AM

true.

Thread: Infinite series (4)

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