Weyl's predicative classical mathematics as a logic-enriched type theory

Robin Adams, Zhaohui Luo

Research output: Contribution to journalArticlepeer-review


We construct a logic-enriched type theory LTTW that corresponds closely to the predicative system of foundations presented by Hermann Weyl in Das Kontinuum. We formalise many results from that book in LTTW, including Weyl's definition of the cardinality of a set and several results from real analysis, using the proof assistant Plastic that implements the logical framework LF. This case study shows how type theory can be used to represent a non-constructive foundation for mathematics.
Original languageEnglish
Article number11
Number of pages31
JournalACM Transactions on Computational Logic
Issue number2
Early online date17 Dec 2009
Publication statusPublished - Jan 2010


  • logic-enriched type theory
  • predicativism
  • formalisation of mathematics

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