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Problem #55

Originator: Richard Statman
Date: June 1993

Summary: In the λ-calculus, which sets have the form {M | Q* PM}?

It has been proved that (in λ-calculus or Combinatory Logic) every recursively enumerable set of ground terms that is closed under conversion has the form {M | PM* Q} for some P and Q. Which sets have the form {M | Q* PM}?


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