# Latex Delimiters: I cannot get the old tex and /tex pair to work.

#### JeffM

##### Elite Member
With the new software, what are the delimiters for LaTeX. I cannot get the old tex and /tex pair to work.

Also, where can you change font size?

#### MarkFL

##### Super Moderator
Staff member
For inline math you can use \ ( \ ) (without the spaces), and for displaystyle math (indented and on its own line) you can use \ [ \ ]. If you click the calculator icon in the toolbar, the [MATH][/MATH] tags will be generated for you which is inline but gives you the larger displaystyle math.

To change your font size use the "T" button to the left of the flag (spoiler) icon.

Thank you

#### mmm4444bot

##### Super Moderator
Staff member
… I cannot get the old tex and /tex pair to work.

Also, where can you change font size?
The tags  do work. Can you send me the problematic text, by private conversation?

Font size may be changed by using the toolbar icon (eighth icon from the left).
$$\displaystyle \;$$

#### JeffM

##### Elite Member
mmm

I was trying to answer a question. When it did not work, I abandoned my answer so I cannot send you what was creating a problem.. What I can tell you is that the answer used displaystyle.

#### pka

##### Elite Member
[ tex]\left( {r\cos \left( {\theta + \frac{{2k\pi }}{4}} \right),r\sin \left( {\theta + \frac{{2k\pi }}{4}} \right)} \right),~k=1,~2,~3[/tex]

$$\displaystyle \left( {r\cos \left( {\theta + \frac{{2k\pi }}{4}} \right),r\sin \left( {\theta + \frac{{2k\pi }}{4}} \right)} \right),~k=1,~2,~3$$

Without the space in [ tex] the code works for me.

#### JeffM

##### Elite Member
$$\displaystyle \sum_{k=m}^n f(k) \equiv f(m) + f(m+1) + \ ... \ + f(n-1) + f(n).$$

This is what I am getting from

\sum_{k=m}^n f(k) \equiv f(m) + f(m+1) + \ ... \ + f(n-1) + f(n).

#### MarkFL

##### Super Moderator
Staff member
Yes, the :(n): text to replace for the (n) smiley needs to be changed. Only an admin can do that.

#### MarkFL

##### Super Moderator
Staff member
$$\displaystyle \sum_{k=m}^n f(k) \equiv f(m) + f(m+1) + \ ... \ + f(n-1) + f( n).$$

For now, use ( n) instead (note the space in front of the n).

#### mmm4444bot

##### Super Moderator
Staff member
[ tex]\left( {r\cos \left( {\theta + \frac{{2k\pi }}{4}} \right),r\sin \left( {\theta + \frac{{2k\pi }}{4}} \right)} \right),~k=1,~2,~3[/tex]

Without the space in [ tex] the code works for me.
Here's a tip, pka. We don't need to play tricks on the system anymore (like inserting spaces), in order to display tags in a post. Enclosing tags within [plain] and [/plain] tags will prevent the system from processing the enclosed code. See the bottom of this post, for more info. Cheers
$$\displaystyle \;$$

pka

#### JeffM

##### Elite Member
So far I like the new software. I never expected it to be bug free, but there really have been few bugs so far. Good work all.

#### mmm4444bot

##### Super Moderator
Staff member
… For now, use ( n) instead (note the space in front of the n).
Thanks, Mark! That's way easier than my 'ol vBulletin LaTeX fix (to suppress keyword autolinking, for instance).

I would have coded something like $$f\text{(}n)$$ to force $$\displaystyle f\text{(}n)$$.

#### mmm4444bot

##### Super Moderator
Staff member
… there really have been few bugs so far …
True, although there are a number of issues being discussed on the (private) staff board, heh …
$$\displaystyle \;$$

#### MarkFL

##### Super Moderator
Staff member
So far I like the new software. I never expected it to be bug free, but there really have been few bugs so far. Good work all.
Yes, XF 2.1 is a robust forum software, coded by some of the folks who brought us vB 3.x way back when. I think its major strengths are responsive design and a lot more AJAX being used to make reloading pages less necessary. Over time we'll get all the reported issues sorted out.