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How do I make relative urls in Scheme?

What is `atom?`

Some definitions of scheme seem to have a primitive called atom? Apparently, DrScheme (PLTScheme) doesn't. Here it is:

(define (atom? x)
  (not (pair? x))

What is a continuation?

You do not need to know about continuations at this point, but they're pretty cool. A continuation is the where-the-program's-going-next context. Here are some resources if you want to learn more:

What about formalizing shell sort?

You do not need to know these details, but for the interested here is some more information about shell sort:

2013-07-17 10:42