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title
Existential Type
description
site name
Existential Type
author
updated
2025-12-22 15:52:21
raw text
Existential Type Existential Type Home About Home Page Research Teaching Programming Sequentiality as the Essence of Parallelism November 4, 2017 I recently thought of a nice way to structure a language for parallel programming around the concept of sequential composition. Think of parallelism as the default—evaluate everything in parallel unless the semantics of the situation precludes it: sums are posterior to summands, but the summands can be evaluated simultaneously. You need a way to express the necessary dependencies without introducing any spurious ones. There’s a tool for that, called lax logic , introduced by Fairtlough and Mendler and elaborated by Davies and Pfenning , which I use extensively in PFPL . The imperative language Modernized Algol is formulated in the lax style, distinguishing two modes , or levels , of syntax, the (pure) expressions and the (impure) commands. The lax modality, which links the two layers, behaves roughly...
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