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> The transfinite recursion form (Tx,y , z)(c, d) has not yet found any applications in programming.

Has it found any applications in the intervening 40 years?

Edit: a more approachable exposition is on p43+ of https://www.cs.tufts.edu/~nr/cs257/archive/per-martin-lof/IT...

Thanks

I guess Martin-Löf speaks about W-Types.

An implementation and examples in Coq:

https://github.com/coq/coq/wiki/WTypeInsteadOfInductiveTypes

Still waiting for the year of W-Types