Yoneda product
id:
yoneda-product-315-17308497
title:
Yoneda product
text:
In algebra, the Yoneda product is the pairing between Ext groups of modules: induced by Specifically, for an element ξ ∈ Ext n , thought of as an extension and similarly we form the Yoneda (cup) product Note that the middle map E n − 1 → F 0 factors through the given maps to M . We extend this definition to include m , n = 0 using the usual functoriality of the Ext ∗ groups.
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wiki
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encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Yoneda_product
date created:
date modified:
2023-06-19T20:33:10Z
main entity:
{"identifier":"Q25098917","url":"https://www.wikidata.org/entity/Q25098917"}
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13
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