"To use functions as arguments, one needs a notation for functions, and it seemed natural to use the λ -notation of Church (1941). I didn't understand the rest of his book, so I wasn't tempted to try to implement his more general mechanism for defining functions."

how do i add the comment to the mainpost? i posted in the "textarea" but it wasnt included in the post...

I believe if you include an url you can't add text to it.