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This tag is used if a reference is needed in a paper or textbook on a specific result.

9 votes
2 answers
428 views

Topological Derivation of Leray Spectral Sequence

I'm interested in computing - to the extent possible - the Leray spectral sequence for a particular map which is almost, but not quite, a fiber bundle (e.g. a Seifert fiber space). The hardest step cu …
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11 votes
1 answer
705 views

What is the precise relationship between forcing on a poset and the topos of double-negation...

I've seen various statements that the Boolean-valued models of ZFC occurring in model-theoretic forcing are "really" the topos of sheaves on an appropriate site, but never a fully precise statement. W …
dorebell's user avatar
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