In the AFP we have four separate copies of the definition
definition list :: "nat \<Rightarrow> 'a set \<Rightarrow> 'a list set"
where
"list n A = {xs. size xs = n \<and> set xs \<subseteq> A}"
Interestingly, the exact same concept is coded in three different ways in the
four definitions. We also have a number of theorems in the repository referring
to this concept:
finite_lists_length_eq
set_n_lists
card_lists_length_eq
lists_length_Suc_eq
And we have three copies of Listn.thy in MicroJava and JinjaThreads. Could
maybe some fragment of this, if not the whole thing, be moved into Library?
Larry
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