The Picard-Vessiot theory, constrained cohomology, and linear differential algebraic groups
Abstract
We prove that a differential field K is algebraically closed and Picard-Vessiot closed if and only if the differential Galois cohomology group H1∂(K,G) is trivial for any linear differential algebraic group G over K. We give an application to the parameterized Picard-Vessiot theory.
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