I hope this question isn't too far outside the scope of the site. I'm using the equation editor in Apple's Pages and it specifically calls for LaTeX code. I'm trying to add spaces between the numbers in the set so it looks like {1, 2, 3} rather than {1,2,3}. Any ideas on what I could add to make that happen?

[![Here's a picture of my attempt[1]](https://i.stack.imgur.com/5bUyD.jpg)