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Description:
We introduce a notion of reduction on resource vectors, i.e. infinite linear combinations of resource lambda-terms. The latter form the multilinear fragment of the differential lambda-calculus introduced by Ehrhard and Regnier, and resource vectors are the target of the Taylor expansion of lambda-terms. We show that the reduction of resource vectors contains the image, through Taylor expansion, of beta-reduction in the algebraic lambda-calculus, i.e. lambda-calculus extended with weighted sums: in particular, Taylor expansion and normalization commute. We moreover exhibit a class of algebraic lambda-terms, having a normalizable Taylor expansion, subsuming both arbitrary pure lambda-terms, and normalizable algebraic lambda-terms. For these, we prove the commutation of Taylor expansion and normalization in a more denotational sense, mimicking the Böhm tree construction.