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What (who) is M-expression LISP - definition
PROPOSED SYNTAX FOR THE LISP LANGUAGE
Meta-expression; M expressions; M expression
M-expression LISP
(MLISP) The original "meta-language" syntax of Lisp,
designed by John McCarthy in 1962. MLISP was intended for
external use in place of the parenthesised S-expression
syntax.
["LISP 1.5 Programmer's Manual", J. McCarthy et al, MIT Press
1962 ].
(1994-11-22)
LISP 1.5
![4.3 BSD]] from the [[University of Wisconsin]], displaying the [[man page]] for [[Franz Lisp]]](https://commons.wikimedia.org/wiki/Special:FilePath/4.3 BSD UWisc VAX Emulation Lisp Manual.png?width=200 "4.3 BSD]] from the [[University of Wisconsin]], displaying the [[man page]] for [[Franz Lisp]]")
![pointer]] diagram for the list (42 69 613)](https://commons.wikimedia.org/wiki/Special:FilePath/Cons-cells.svg?width=200 "pointer]] diagram for the list (42 69 613)")
![A [[Lisp machine]] in the [[MIT Museum]]](https://commons.wikimedia.org/wiki/Special:FilePath/LISP machine.jpg?width=200 "A [[Lisp machine]] in the [[MIT Museum]]")
FUNCTIONAL PROGRAMMING LANGUAGE BASED ON THE LAMBDA CALCULUS
LISP programming language; Lisp computer language; Lisp atom; Lisp language; LISP language; LISP (programming language); LISP atom; Lisp programming language; LISP (programming); Lisp (programming); Programmable programming language; Lisp renaissance; LISP 1.5; Lisp 1.5; Lithp (programming language); Defun; List Processing; LISP; List processing language; Lisp (language); MuLISP; Lots of Irritating Superfluous Parentheses; Lisp operators; History of the Lisp programming language; Lambde expressions in Lisp; Control structures in Lisp; Object systems in Lisp
S-expression
DATA SERIALIZATION FORMAT OFTEN USED FOR LISP
S expression; S-expressions; Sexp; S-exp; S expressions; S-Expression; Sexps; Lisp syntax; Sexpr; S-expr
In computer programming, an S-expression (or symbolic expression, abbreviated as sexpr or sexp) is an expression in a like-named notation for nested list (tree-structured) data. S-expressions were invented for and popularized by the programming language Lisp, which uses them for source code as well as data.
Wikipedia
M-expression
In computer programming, M-expressions (or meta-expressions) were an early proposed syntax for the Lisp programming language, inspired by contemporary languages such as Fortran and ALGOL. The notation was never implemented into the language and, as such, it was never finalized.
Compared to S-expressions, M-expressions introduce function notation, infix operators (including a defun operator), and shorthands for cond and list into the language.
