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changed the proof 2019-09-23 2bdffb7
More general kunneth

The first lemma is a very general result

The second lemma will be used for the de Rham complex soon; its proof
very carefully uses cup product of cocycles to make sure the map is
indeed given by cup product...
changed the proof 2019-03-21 b9628d4
Fixed two smaller typos.
assigned tag 0BED 2015-06-05 046ea46
Tags: Added new tags
created statement with label lemma-kunneth in varieties.tex 2015-06-02 d987a0f
K\"unneth

Horrible because in the proofs we try to avoid using anything at all
about the precise definition of the cup products...