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changed the proof 2013-01-26 5348388
Clean up the material from last commit

The claims on duals of pseudo-coherent complexes were too optimistic. As
a replacement we directly construct a base change map for pushforwards
of internal homs. Then we show this is a qis by the induction principle.

We also fixed the proof of the lemma on duals of perfect objects as the
previous one was nonsense.

Finally, we improve the (trivial) lemma on vanishing of Ext groups
between objects of the derived category.
assigned tag 08BX 2012-12-15 0dc0f11
Tags: Added new tags
created statement with label lemma-unbounded-mayer-vietoris in cohomology.tex 2012-12-11 165e136
Mayer-Vietoris

Unbounded version on ringed spaces