[isabelle] Inductive Set Definitions



Morning all, I have been away from Isabelle for a long time. Now I need to define inductively a function that takes a set and returns a set of sets, built inductively starting from the input one.

In the previous versions of Isabelle i used the "induct" construct to do that, but with the later version its counterpart "induct_set" does not allow this.

How can I do? The only way is to define a recursive function?

Thanks in advance,
Cristiano Longo






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