The Stacks project

Fix coding style in categories

Fix typo

Thanks to Jean-Pierre Gourdot

Define cartesian and cocartesian squares

Thanks to Fred Rohrer
http://stacks.math.columbia.edu/tag/001U#comment-153
http://stacks.math.columbia.edu/tag/0025#comment-154
http://stacks.math.columbia.edu/tag/001V#comment-155

'push out' ---> 'pushout'

LaTeX: get rid of useless brackets

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

Continued...

	modified:   categories.tex
	modified:   sets.tex
	modified:   sites.tex