BibTeX: 
@article{Irrationals_From_THEBOOKAFP,
author = {Lawrence C Paulson},
title = {Irrational numbers from THE BOOK},
journal = {Archive of Formal Proofs},
month = jan,
year = 2022,
note = {\url{https://isaafp.org/entries/Irrationals_From_THEBOOK.html},
Formal proof development},
ISSN = {2150914x},
}
