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- W1587788015 abstract "Given a discrete subgroup Γ of a connected real semisimple Lie group G with finite center there is a natural homomorphism $$j_Gamma ^q:I_G^q to {H^q}left( {Gamma ;c} right)quad left( {q = 0,1, ldots } right),$$(1)where I G q denotes the space of G-invariant harmonic q-forms on the symmetric space quotient X=G/K of G by a maximal compact subgroup K. If Γ is cocompact, this homomorphism is injective in all dimensions and the main objective of Matsushima in [19] is to give a range m(G), independent of Γ, in which j Γ q is also surjective. The main argument there is to show that if a certain quadratic form depending on q is positive non-degenerate, then any Γ-invariant harmonic q-form is automatically G-invariant. In [3], we proved similarly the existence of a range in which j Γ q is bijective when Γ is arithmetic, but not necessarily cocompact. There are three main steps to the proof: (i) The cohomology of Γ can be computed by using differential forms which satisfy a certain growth condition, “logarithmic growth,” at infinity; (ii) up to some range c(G), these forms are all square integrable; and (iii) use the fact, pointed out in [16] , that for q ≦ m(G), Matsushima’s arguments remain valid in the non-compact case for square integrable forms." @default.
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- W1587788015 date "1981-01-01" @default.
- W1587788015 modified "2023-10-01" @default.
- W1587788015 title "Stable Real Cohomology of Arithmetic Groups II" @default.
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- W1587788015 doi "https://doi.org/10.1007/978-1-4612-5987-9_2" @default.
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