tutorial

(Source and copyright: Sean Luke - George Mason University, cs.gmu.edu/~sean/lisp/LispTutorial3.html)

(Source and copyright: Sean Luke - George Mason University, cs.gmu.edu/~sean/lisp/LispTutorial2.html)

(Source and copyright: Sean Luke - George Mason University, cs.gmu.edu/~sean/lisp/LispTutorial.html)

The Ackermann function is a killer: It looks very simple, yet it plays a major
role in computer science and computational complexity theory. This is its
definition.

(Source and copyright: kosara.net/thoughts/ackermann.html)

In most other programming languages, new abstractions are built by writing code on /top/ of existing abstractions. But in lisp, its possible to build new abstractions by writing code *beneath* existing code.

(Source and copyright: cybertiggyr.com/gene/peval/peval.cgi)