This opens a new series of posts, which will turn us back to the “computing with space” theme, the main interest here at chorasimilarity.
Look again at the move R2 of graphic lambda calculus.
The epsilon and mu are, originally, elements of a commutative group. Suggestions have been made repeatedly that the commutative group can be anything.
The epsilon and mu are port names, just like the red 1, 2, 3 from the figure.
In the more recent drawing conventions (not that that matters for the formalism) the port names are in blue.
Here is again the same move, but without the epsilon and mu.
Of course, the green node is the fanout, in the chemlambda version.
Yes, eventually, everything is related to everything in this open notebook.
In the next posts I shall take it step by step.