I wouldn't recommend using infix libraries if you really want to get into Common Lisp though. They're a bit of a crutch for people coming from other languages,

I wouldn't recommend using infix libraries if you really want to get into Common Lisp though. They're a bit of a crutch for people coming from other languages, but that's it. Pretty much the whole language is based on Polish notation. The sooner you realise that + - * / are just function names like any other, the better you'll do. For example: (+ 1 2 3) in plain symbols is just: (function parameter parameter parameter) But if I were to write my own addition function: (addition 1 2 3) it would also be: (function parameter parameter parameter) and so is: (http-request "http://www.google.com") (function parameter) If you use infix notation, you're writing half your code in a competely different semantic to the other half. I can't imagine it helping people really get a proper grasp of how Common Lisp works.