The Stacks project

Composition admissible blowups

	This commit also includes some really basic material on relative
	proj which was so far missing from the project. Probably because
	we haven't found a way to present this material in a good way.

Universal property of blowing up

	Seems to be completely general. Also we moved all the material
	on blowups together in a section of divisors.tex which makes a
	lot of sense as the universal property is all about divisors...

zerodivisor and nonzerodivisor

	Seems better this way.

LaTeX: \Spec

	Introduced the macro

	\def\Spec{\mathop{\rm Spec}}

	and changed all the occurences of \text{Spec} into \Spec.

Latex: get rid of some overfull boxes

	modified:   algebraic.tex
	modified:   chow.tex
	modified:   coherent.tex
	modified:   cohomology.tex
	modified:   constructions.tex
	modified:   descent.tex
	modified:   desirables.tex
	modified:   divisors.tex
	modified:   etale.tex
	modified:   examples-stacks.tex
	modified:   examples.tex
	modified:   exercises.tex
	modified:   fdl.tex
	modified:   homology.tex
	modified:   hypercovering.tex
	modified:   modules.tex
	modified:   morphisms.tex
	modified:   properties.tex
	modified:   schemes.tex
	modified:   simplicial.tex
	modified:   sites.tex
	modified:   spaces.tex
	modified:   topologies.tex
	modified:   varieties.tex

New tags added to the project

	modified:   tags/tags

Another blow up lemma in preparation for the main blow up lemma

	modified:   chow.tex
	modified:   constructions.tex
	modified:   divisors.tex