I will give an overview of different occurrences of tubings of rooted trees in combinatorics and physics and then explain how one kind of tubing of rooted trees can be used to give series solutions of Dyson—Schwinger equations in quantum field theory.
Links:
[1] https://www.mpim-bonn.mpg.de/taxonomy/term/39
[2] https://www.mpim-bonn.mpg.de/node/3444
[3] https://www.mpim-bonn.mpg.de/node/13069