How to make brackets bigger?

Question

I have the following expression here.

$$\{\|\frac{f_i(x_i+h)-f_i(x-k)}{h}\|\}$$

I want to make the outer most brackets and the modulus sign to be bigger.

I have tried

$$\Bigg{\Bigg|\frac{f_i(x_i+h)-f_i(x-k)}{h}\Bigg|\Bigg}$$

but this doe not seem to work.

What can I do?

\Biggl\{\biggl|...\biggr|\Biggr\}. And don’t use $$! — GuM, Aug 10 '16 at 09:32
They work fine, but the braces are \{ ... \} not {...}, also consider using \Biggl ... \Biggr in order to get the correct classes. — daleif, Aug 10 '16 at 09:32

score 2 · Answer 1 · answered Aug 10 '16 at 14:29

\Bigg{ and \Bigg} are errors; it should be \Bigg\{ and \Bigg\}, respectively.

Actually, there's no need to \Bigg (pun intended) -- \bigg is the correct size for the fractional term at hand. Thus, you should enter the displayed equation as follows:

\[
\biggl\{\biggl| \frac{f_i(x_i+h)-f_i(x-k)}{h} \biggr|\biggr\}
\]

Note that I use \biggl and \biggr instead of just \bigg for the "fence symbols". For the present equation this makes no difference in appearance. However, there would be a major difference if the fractional expression were preceded by a unary minus (or plus) symbol.

score 0 · Answer 2 · edited Aug 10 '16 at 16:28

0

You can try \right\{ and \left\{. These commands adjust the size of the braces to their contents.

edited Aug 10 '16 at 16:28

Werner

603,163

answered Aug 10 '16 at 14:47

Ger

187

1

\{. Your answer has the same omission as the OP. – Willie Wong Aug 10 '16 at 14:49

How to make brackets bigger?

2 Answers2