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log-e-sappho/docs/about/contributions.md

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Contributions

  • We introduce a type system able to express predicated types, a unified way to express existance of method- and traits depending on some predicate on the subtyping relation.
  • We define our subtyping relation as a natural extension to type systems based on semantic subtyping.
  • We express our subtyping using a novel approach based on the sequent calculus.
  • We show the correctness of our subtyping relation and type system.
  • We explain how this type system may be used to succinctly describe programs involving for example capabilities and constructions such as type classes.
  • We have implemented the type system and give examples of how its use simplifies expressing many properties in object oriented languages, including things like...