# Math Help - \lim{} weirdness and \norm{} disfunctional

1. ## \lim{} weirdness and \norm{} disfunctional

I just posted and found something weird. The 'limit' tag worked in preview, but then in post it changed the "h -> 0" to a subscript - not an underscript, namely: $\lim_{h\rightarrow0}$

The 'norm' tag does not work, so I used double vertical bars $||\vec{x}||$.

2. Originally Posted by livingdog
I just posted and found something weird. The 'limit' tag worked in preview, but then in post it changed the "h -> 0" to a subscript - not an underscript, namely: $\lim_{h\rightarrow0}$

The 'norm' tag does not work, so I used double vertical bars $||\vec{x}||$.
To get $\displaystyle{\lim_{h \to 0}$ you have to use the \displaystyle command.

3. For me, even in the preview, I get subscripts for limits, not underscripts like I'd prefer.

4. For the norm, use \| (backslash vertical bar) to get $\|$.

5. [I] the limit: (from The Art Of Problem Solving)

"That summation symbol is a little ugly. We can make it prettier by using the \displaystyle:" (edited for this thread)

$
\displaystyle\lim_{h\rightarrow0}\frac{1}{h} \neq 0
$

[II] the norm:

backslash norm $\|\vec{x}\|$ $\leftarrow$
vs
piped norm $||\vec{x}||$ $\leftarrow$

[III] Here are more symbols than one should be allowed to know:

aka
The Comprehensive LaTeX Symbol List.