English
H0(A) is defined as the zeroth cohomology of the complex of inhomogeneous cochains of A; in other words, the space of G-invariants in A modulo the trivial coboundaries.
Русский
H0(A) определяется как нулевая когомологија комплекса неоднородных кокозиал A; то есть пространство инвариантов G в A по модулю тривиальных кобоундрарий.
LaTeX
$$$H0(A) := groupCohomology(A,0)$$$
Lean4
/-- Shorthand for the 0th group cohomology of a `k`-linear `G`-representation `A`, `H⁰(G, A)`,
defined as the 0th cohomology of the complex of inhomogeneous cochains of `A`. -/
abbrev H0 :=
groupCohomology A 0