Perlis's three-pronged formulation:
A programming language provides mechanisms for
o identifying a data type or data types,
o specifying operations on them, and
o speciifying a path or paths of control among these operations,
has not been improved upon in, now, forty odd years; and it seems unlikely
that it will be possible to replace it with a more perspicuous formulation
anytime soon.
On Perlis's formulation LISP is a programming language.
John Gilmore
Ashland, MA 01721-1817
USA
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