
LaTex Help Help with LaTex and writing math equations 
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August 31st, 2010, 05:32 AM  #1 
Newbie Joined: Jul 2010 Posts: 17 Thanks: 0  LaTeX help
Hey. I'm just starting working on LaTeX. For the sake of greater clarity I'll only show where the problem is, also because I think the problem can be solved within what is below: Dada uma família não vazia de conjuntos não vazios $\cal A$=\{A_i\}_{i\in I} existe uma função In the above sentence, after $\cal A$=\{A_i\}_{i\in I}, LaTeX ignores all spaces, and so the output is something like: Dada uma família não vazia de conjuntos não vazios $\cal A$=\{A_i\}_{i\in I} existeumafunção Can anyone tell me how I can solve this? Thanks. 
August 31st, 2010, 07:14 AM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 932 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: LaTeX help
You have an opening $ without a closing $. Add the closing $.

August 31st, 2010, 05:57 PM  #3 
Newbie Joined: Jul 2010 Posts: 17 Thanks: 0  Re: LaTeX help
I only open $ once, and I close it too as you can see below: Dada uma família não vazia de conjuntos não vazios $\cal A$=\{A_i\}_{i\in I} existe uma função Any ideas? 
August 31st, 2010, 06:16 PM  #4 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 932 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: LaTeX help
Well, move the $ right so it encloses all the math.

September 1st, 2010, 03:04 AM  #5 
Newbie Joined: Jul 2010 Posts: 17 Thanks: 0  Re: LaTeX help
Your suggestion solves the problem, but creates new ones. I want to apply \cal only to first A, in doing what you told me, every letter gets affected by \cal. Not only that, the character i turns into some sort of bracket. What can I do? Thanks for the help. 
September 1st, 2010, 03:52 AM  #6 
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: LaTeX help
Enclose it in braces: [color=#0000BF]{\cal A}=...[/color] 
September 1st, 2010, 04:19 AM  #7 
Newbie Joined: Jul 2010 Posts: 17 Thanks: 0  Re: LaTeX help
Thanks, your suggestion, written below, solved. ${\cal A}=\{A_i\}_{i\in I}$ existe uma 

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