The Stacks project

Add missing products in sites.tex

Thanks to Rene
http://stacks.math.columbia.edu/tag/00WP#comment-1078

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.

Sites: Localizing morphisms of topoi

	Realized this was missing whilst working out details on
	functoriality of small etale topoi.

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

Added material on descending disjoint unions of spectra artian rings,
also added new file groupoid-schemes.tex to discuss groupoids in
schemes.

Can't stop adding stuff

Finished writing about topologies up to the
characterization of a topology in terms of
its sheaves

Added obvious material on going up down and specialization

	modified:   algebra.tex
	modified:   sites.tex
	modified:   topology.tex

Points...

	modified:   categories.tex
	modified:   sites.tex