[isabelle] new in the AFP: Recursion Theorem in ZF

You wait hours for a bus and then two come along at the same time. And so somehow, the first ever AFP entry for Isabelle/ZF has been followed by a second entry: "Recursion Theorem in ZF", by Georgy Dunaev:

> This document contains a proof of the recursion theorem. This is a mechanization of the proof of the recursion theorem from the text Introduction to Set Theory, by Karel Hrbacek and Thomas Jech. This implementation may be used as the basis for a model of Peano arithmetic in ZF. While recursion and the natural numbers are already available in Isabelle/ZF, this clean development is much easier to follow.

It’s online at https://www.isa-afp.org/entries/Recursion-Addition.html

Larry Paulson

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