# Calkin–Wilf tree

> tree in which the vertices correspond 1-for-1 to the positive rational numbers

**Wikidata**: [Q4158811](https://www.wikidata.org/wiki/Q4158811)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Calkin–Wilf_tree)  
**Source**: https://4ort.xyz/entity/calkin-wilf-tree


## References

1. [Source](https://www.math.upenn.edu/~wilf/website/recounting.pdf)