User blog comment:Googology Noob/Ordinal FGH, with an actual definition!/@comment-27173506-20151218211444/@comment-1605058-20151219081307

The problem was that LaTeX doesn't work with multiple sub/superscripts, unless they are bracketed, i.e. \omega^\omega^\omega fails to compile, and you have to do either {\omega^\omega}^\omega or \omega^{\omega^\omega} (in your case it's the latter). I have fixed these for you, and the code now compiles, but you have quite a bit of formatting to fix :P