### Abstract

This theory contains the involution-based proof of the two squares theorem from THE BOOK.

### License

BSD License

### Topics

- Mathematics/Number theory

### Session Involutions2Squares

- Involutions2Squares

## Cite

×

Involutions2Squares-AFP

    @article{Involutions2Squares-AFP,
      author  = {Maksym Bortin},
      title   = {From THE BOOK: Two Squares via Involutions},
      journal = {Archive of Formal Proofs},
      month   = {August},
      year    = {2022},
      note    = {\url{https://isa-afp.org/entries/Involutions2Squares.html},
                 Formal proof development},
      ISSN    = {2150-914x},
    }

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Older releases:

- Sep 13, 2023 : Isabelle2023
- Oct 27, 2022 : Isabelle2022
- Aug 15, 2022 : Isabelle2021-1