My Math Forum LaTeX help

 LaTex Help Help with LaTex and writing math equations

 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: 938 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: 938 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] ${\cal A}=\{A_i\}_{i\in I}$  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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