> Not sure what inexact=? does. What's needed is something like a
> three-argument function that tests |x-y| < epsilon. Epsilon should
> not be implicit.
It's not in the racket/base language, but it sounds like you're
describing =~ from the teaching languages:
http://docs.racket-lang.org/htdp-langs/advanced.html?q=%3D~#(def._(lib._htdp-advanced..rkt._lang)._((lib._lang/htdp-advanced..rkt)._~3d~7e))
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