This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
CalkinWilf tree.svg Calkin Wilf tree drawn using an tree layout This tree contains each positive rational number exactly once it is rooted at and the two children of are ab and ab own David Eppstein Calkin Wilf tree and sequence Files by User David Eppstein from en
Page 2023 Free-images.com. All images are Public Domain