[ret2pop]

Thanks for your feedback! I'm not accusing you of not reading the full article, but you should if you haven't already. Also, we don't know the extent to which we made anything new; if you think you can do what we're doing in lisp in some way, you're free to prove us wrong.

[JonChesterfield]

I'm pretty sure postfix and prefix encode the same space of languages. They parse to the same tree.