Arrighi, Pablo and Diaz-Caro, Alejandro - A System F accounting for scalars

lmcs:846 - Logical Methods in Computer Science, February 27, 2012, Volume 8, Issue 1
A System F accounting for scalars

Authors: Arrighi, Pablo and Diaz-Caro, Alejandro

The Algebraic lambda-calculus and the Linear-Algebraic lambda-calculus extend the lambda-calculus with the possibility of making arbitrary linear combinations of terms. In this paper we provide a fine-grained, System F-like type system for the linear-algebraic lambda-calculus. We show that this "scalar" type system enjoys both the subject-reduction property and the strong-normalisation property, our main technical results. The latter yields a significant simplification of the linear-algebraic lambda-calculus itself, by removing the need for some restrictions in its reduction rules. But the more important, original feature of this scalar type system is that it keeps track of 'the amount of a type' that is present in each term. As an example of its use, we shown that it can serve as a guarantee that the normal form of a term is barycentric, i.e that its scalars are summing to one.

Source :
DOI : 10.2168/LMCS-8(1:11)2012
Volume: Volume 8, Issue 1
Published on: February 27, 2012
Submitted on: June 25, 2015
Keywords: Computer Science - Logic in Computer Science,Computer Science - Programming Languages,Quantum Physics,F.4.1


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