Functionhood statement for |s (#2372)
Functionhood statement for |s (#2372)

* Added example of completness script

* proved functionhood predicate for |s

* give the option definitions

* typo in definition of _Old

* proved madeval

* prove imaindm and rewrap

* work on _M

* Rewrap

* dumb typo in right/left definitions
metamath/set.mm,metamath/set.mm,metamath/set.mm