Stop show with sound -- Keyboard shortcut: 'x'  Next slide in show -- Keyboard shortcut: 'n'  1 minute, 15 secondsName binding, Recursion, Iteration, and Continuations - slide 7 : 42

The letrec namebinding construct
The letrec name binding construct allows for definition of mutually recursive functions
(letrec ((n1 e1)
         ...
         (nk ek))
  body-expr)
(letrec ((f1 (lambda (...) ... (f2 ...)))
         (f2 (lambda (...) ... (f1 ...)))
        )
  body-expr)