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seven trees in one

Seven trees in one

Seven trees in one

Idea

There is a natural bijection between the set of finite binary trees and the set of seven-tuples of such.

This observation, originally made by Bill Lawvere, has since then been expanded to other “polynomial equations” apart from TT 7T \simeq T^7 and other types than trees, revealing connections between type theory and calculus.

References

Last revised on June 1, 2021 at 12:14:21. See the history of this page for a list of all contributions to it.