• ## Ackbach

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• ### Recent Forum Posts

#### Re: 281 7.5.9 int wiht partail fractions

Yeah but I still sometimes miss those old days where DOS was high tech and Windows hadn't been invented yet.

-Dan

topsquark Today, 21:16

#### Re: 281 7.5.9 int wiht partail fractions

wow with 377 views that was a great help

they did one in class but I got lost on getting A and B

really appreciate the steps

karush Today, 17:16

#### Re: sum of infinite series

A quick note:
$\displaystyle \sum_{k = 1}^{\infty} \dfrac{k^2}{2^k} \neq \sum_{k = 1}^{\infty} k^2 \cdot \sum_{k = 1}^{\infty} \dfrac{1}{2 ^k}$

topsquark Today, 15:59

#### Re: Characteristics of rings

(a) Show that if the ring has characteristic zero then the elements $n\cdot 1\ (n\in\Bbb{N})$ are all different.

(b) If the characteristic

Opalg Today, 15:51

#### sum of infinite series

Hi, I'm trying to solve the sum of following infinite series:

$\displaystyle \sum_{k=1}^{\infty} \frac{{k}^{2}+4}{{2}^{k}} = \sum_{k=1}^{\infty}$

goohu Today, 14:51