The Stacks project

Fixing some mistakes

Thanks to Fred Rohrer
http://stacks.math.columbia.edu/tag/05N2#comment-143
http://stacks.math.columbia.edu/tag/000J#comment-144
http://stacks.math.columbia.edu/tag/001K#comment-145
http://stacks.math.columbia.edu/tag/004R#comment-146

Whitespace changes

LaTeX: Remove useless brackets

LaTeX: \Ob

	Introduced a macro

	\def\Ob{\mathop{\rm Ob}\nolimits}

	and replaced any occurence of \text{Ob}( with \Ob(. There are
	still some occurences of \text{Ob} but these are sets, not the
	operator that takes the set of objects of a category.

LaTeX: \Mor

	Introduced a macro

	\def\Mor{\mathop{\rm Mor}\nolimits}

	and replaced all the occurences of \text{Mor} with \Mor.

Started tags infrastructure

	new file:   scripts/add_tags.py
	modified:   scripts/functions.py
	new file:   tags/initial_tags
	new file:   tags/tags

More neurotic changes

Introduce (2,1)-categories.

	modified:   categories.tex