Ponder - Jon Fairbairn,. Polymorphic, non-strict
functional language. Has a type system similar to Girards System F
("Proofs and Types", J-Y. Girard, Cambridge U Press 1989), also known as
Lambda-2 or the polymorphic lambda calculus. Ponder adds extra recursive
mu types to those of F, allowing more general recursion. "Ponder and its
Type System", J. Fairbairn, TR 31, Cambridge U Computer Lab, Nov 1982.
"Subtyping in Ponder", V. Paiva, TR 203, Aug 1990.
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