Simon explains strong and weak tree sequences and reveals the greatest finite number used in mathematics: TREE(3), a lot larger than Graham’s number. The TREE sequence is a fast-growing function arising out of graph theory.
Simon comments: “What is you make TREE(TREE(3))?”
Inspired by:
http://googology.wikia.com/wiki/TREE_sequence
https://www.youtube.com/watch?v=3P6DWAwwViU
Geeks out of the box 