Typechecking is Undecidable when 'Type' is a Type

A function has a dependent type when the type of its result depends upon the value of its argument. The type of all types is the type of every type, including itself. In a typed l-calculus, these two features synergize in a conceptually clean and uniform way to yield enormous expressive power at ve...

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Автор: Reinhold, Mark B.
Опубліковано: 2023
Онлайн доступ:https://hdl.handle.net/1721.1/149683
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author Reinhold, Mark B.
author_facet Reinhold, Mark B.
author_sort Reinhold, Mark B.
collection MIT
description A function has a dependent type when the type of its result depends upon the value of its argument. The type of all types is the type of every type, including itself. In a typed l-calculus, these two features synergize in a conceptually clean and uniform way to yield enormous expressive power at very little apparent cost. By reconstructing and analyzing a paradox due to Girard, we argue that there is no effective typechecking algorithm for such a language.
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institution Massachusetts Institute of Technology
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spelling mit-1721.1/1496832023-03-30T03:42:17Z Typechecking is Undecidable when 'Type' is a Type Reinhold, Mark B. A function has a dependent type when the type of its result depends upon the value of its argument. The type of all types is the type of every type, including itself. In a typed l-calculus, these two features synergize in a conceptually clean and uniform way to yield enormous expressive power at very little apparent cost. By reconstructing and analyzing a paradox due to Girard, we argue that there is no effective typechecking algorithm for such a language. 2023-03-29T15:16:29Z 2023-03-29T15:16:29Z 1989-12 https://hdl.handle.net/1721.1/149683 21105894 MIT-LCS-TR-458 application/pdf
spellingShingle Reinhold, Mark B.
Typechecking is Undecidable when 'Type' is a Type
title Typechecking is Undecidable when 'Type' is a Type
title_full Typechecking is Undecidable when 'Type' is a Type
title_fullStr Typechecking is Undecidable when 'Type' is a Type
title_full_unstemmed Typechecking is Undecidable when 'Type' is a Type
title_short Typechecking is Undecidable when 'Type' is a Type
title_sort typechecking is undecidable when type is a type
url https://hdl.handle.net/1721.1/149683
work_keys_str_mv AT reinholdmarkb typecheckingisundecidablewhentypeisatype