• #39 Equality, Quotation, Bidirectional Type Checking - David Christiansen

  • Jun 13 2024
  • Length: 1 hr and 50 mins
  • Podcast

#39 Equality, Quotation, Bidirectional Type Checking - David Christiansen

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  • Summary

  • In this episode we continue our conversation with David Christiansen, he wrote the books Functional Programming in Lean and the Little Typer.

    He has also worked as the Executive Director of the Haskell Foundation, at Galois and did his PhD developing a bunch of cool stuff for Idris.

    In today’s episode we talk about the story behind writing The Little Typer together with Dan Friedman, and we get more technical by talking about Equality, Bidirectional Type Checking, Quotation and Quasi Quotation.

    If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall

    Links:
    • David's Website
    • David's X
    • Lean Zulip Chat
    • Truth of a proposition, evidence of a judgement, validity of a proof
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