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Étale cohomology
In mathematics, the Ă©tale cohomology theory of algebraic geometry is a refined construction of homological algebra, introduced in order to attack the Weil conjectures. This eventually proved successful as a strategy, although Dwork managed to prove the rationality part of the conjectures in 1960 using p-adic methods; the remaining conjectures awaited the development of Ă©tale cohomology.
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