Question: given an ocaml definition of a recursive function foo:nat - - > nat, how do you write its definition using letrec in the simply typed

given an ocaml definition of a recursive function foo:nat --> nat,
how do you write its definition using letrec in the simply typed lambda calculus. (letrec requires that the definition be USED after it is defined as in letrec foo:typ = whatever in foo 3).
How do you to translate that into a definition using FIX t
How dp you evaluate it.
how to type a term (and give its typing derivation) that uses let, or fix

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