Murderous Maths, Simon teaching, Simon's sketch book

Larger than Graham’s number!

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