Feasible Operations and Applicative Theories Based on lambda-eta

  title={Feasible Operations and Applicative Theories Based on lambda-eta},
  author={Andrea Cantini},
  journal={Math. Log. Q.},
We study a theory PTO(λη) of polynomial time computability on the type of binary strings (in the style of [6]), as embedded in full lambda calculus with total application and extensionality. We prove that the closed terms of (provable) type W −→ W are exactly the polynomial time operations. This answers a conjecture of Strahm [13]. Mathematics Subject Classification: 03F30, 03F50, 03B40. 

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