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arXiv · 1904.08843

Behavioural Equivalence via Modalities for Algebraic Effects

Alex Simpson·Niels Voorneveld
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Abstract

The paper investigates behavioural equivalence between programs in a call-by-value functional language extended with a signature of (algebraic) effect-triggering operations. Two programs are considered as being behaviourally equivalent if they enjoy the same behavioural properties. To formulate this, we define a logic whose formulas specify behavioural properties. A crucial ingredient is a collection of modalities expressing effect-specific aspects of behaviour. We give a general theory of such modalities. If two conditions, openness and decomposability, are satisfied by the modalities then the logically specified behavioural equivalence coincides with a modality-defined notion of applicative bisimilarity, which can be proven to be a congruence by a generalisation of Howe's method. We show that the openness and decomposability conditions hold for several examples of algebraic effects: nondeterminism, probabilistic choice, global store and input/output.

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Alex Simpson, Niels Voorneveld. 2019-04-18. Behavioural Equivalence via Modalities for Algebraic Effects. https://arxiv.org/abs/1904.08843

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