# Thread: Sum with limits

1. ## Sum with limits

Hi

How do you tex a sum with limits, i.e. sum from n=1 to infinity, or something like this? please

2. ## Re: Sum with limits

Originally Posted by Shizaru
How do you tex a sum with limits, i.e. sum from n=1 to infinity, or something like this
[TEX]\sum\limits_{k = 2}^\infty {\frac{{\left( { - 1} \right)^k }}{{2^{k + 1} }}} [/TEX] gives
$\displaystyle \sum\limits_{k = 2}^\infty {\frac{{\left( { - 1} \right)^k }}{{2^{k + 1} }}}$

3. ## Re: Sum with limits

Originally Posted by Plato
[TEX]\sum\limits_{k = 2}^\infty {\frac{{\left( { - 1} \right)^k }}{{2^{k + 1} }}} [/TEX] gives
$\displaystyle \sum\limits_{k = 2}^\infty {\frac{{\left( { - 1} \right)^k }}{{2^{k + 1} }}}$
1/12

4. ## Re: Sum with limits

Originally Posted by Also sprach Zarathustra
1/12
That was a positing to show how to use LaTeX code.
It was not intended as a problem to be worked.

5. ## Re: Sum with limits

Originally Posted by Plato
That was a positing to show how to use LaTeX code.
It was not intended as a problem to be worked.
I'm sure that Also sprach Zarathustra knew it, and his answer was to show some sense of humor (good or bad, but at any case, sense of humor).

6. ## Re: Sum with limits

Originally Posted by FernandoRevilla
I'm sure that Also sprach Zarathustra knew it, and his answer was to show some sense of humor (good or bad, but at any case, sense of humor).

7. ## Re: Sum with limits

I don't think you need the \limits for your sum. e.g.

\sum_{i=1}^{\infty} \frac{1}{2^i} = 1 yields
$\displaystyle \sum_{i=1}^{\infty} \frac{1}{2^i}= 1$