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A doctrinal approach to modal/temporal Heyting logic and non-determinism in processes

Published online by Cambridge University Press:  27 February 2017

PAOLO BOTTONI
Affiliation:
Dipartimento di Informatica, “Sapienza” Università di Roma, Rome, Italy Email: bottoni@di.uniroma1.it, gorla@di.uniroma1.it, labella@di.uniroma1.it
DANIELE GORLA
Affiliation:
Dipartimento di Informatica, “Sapienza” Università di Roma, Rome, Italy Email: bottoni@di.uniroma1.it, gorla@di.uniroma1.it, labella@di.uniroma1.it
STEFANO KASANGIAN
Affiliation:
Dipartimento di Matematica, Università di Milano, Milan, Italy Email: stefano.kasangian@gmail.com
ANNA LABELLA
Affiliation:
Dipartimento di Informatica, “Sapienza” Università di Roma, Rome, Italy Email: bottoni@di.uniroma1.it, gorla@di.uniroma1.it, labella@di.uniroma1.it

Abstract

The study of algebraic modelling of labelled non-deterministic concurrent processes leads us to consider a category LB, obtained from a complete meet-semilattice B and from B-valued equivalence relations. We prove that, if B has enough properties, then LB presents a two-fold internal logical structure, induced by two doctrines definable on it: one related to its families of subobjects and one to its families of regular subobjects. The first doctrine is Heyting and makes LB a Heyting category, the second one is Boolean. We will see that the difference between these two logical structures, namely the different behaviour of the negation operator, can be interpreted in terms of a distinction between non-deterministic and deterministic behaviours of agents able to perform computations in the context of the same process. Moreover, the sorted first-order logic naturally associated with LB can be extended to a modal/temporal logic, again using the doctrinal setting. Relations are also drawn to other computational models.

Type
Paper
Copyright
Copyright © Cambridge University Press 2017 

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