Deflation and residuation for class formation (Q5958878)

The first paragraph recalls the deflation map and the residuation map in the cohomology of finite groups followed by the second paragraph, of great importance: the main result of it establishes that a certain diagram is commutative, i.e., it is obtained that the associated residuation map corresponds to the associated deflation map. This result provides a commutative diagram for Galois cohomology groups, that generalizes a fundamental diagram for number knots.