Source-pinned research

Research proof index

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Project-declaredLean 4.33.0-rc1

Is Zero of Even odd

Rep.isZero_ofEven_odd

Plain-language statement

Let M be a representation of a finite cyclic group G. Suppose there are even and positive integers e and o with e even and o odd, such that Hᵉ(G,M) and Hᵒ(G,M) are both zero. Then Hⁿ(G,M) is zero for all n > 0.

number theoryclass field theorylocal fields

Source project: Class Field Theory

Person-level attribution pending.

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Project-declaredLean 4.33.0-rc1

Map₁ comp ind₁' iso coind₁

Rep.map₁_comp_ind₁'_iso_coind₁'

Plain-language statement

Let M be a representation of a finite cyclic group G. Then the following square commutes coind₁'.obj M -------> coind₁'.obj M | | | | ↓ ↓ ind₁'.obj M -------> ind₁'.obj M The vertical maps are the canonical isomorphism ind₁'_iso_coind₁ and the horizontal maps are map₁ and map₂.

number theoryclass field theorylocal fields

Source project: Class Field Theory

Person-level attribution pending.

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