[racket] typo in signatures?

check-within

http://docs.racket-lang.org/test-engine/index.html#(def._((lib._test-engine/racket-tests..rkt)._check-within))

On Tue, Oct 4, 2011 at 1:48 PM, Hendrik Boom <hendrik at topoi.pooq.com> wrote:
> On Tue, Oct 04, 2011 at 12:50:36PM -0400, Matthias Felleisen wrote:
>>
>> For testing, you want to use check-within because check-expects fails.
>>
>> For real programming, you actually want to use inequality comparisons,
>> so that they see how to program with Doubles elsewhere.
>>
>> For teaching abstraction, you may ask why repeat all these (<= n x n+epsilon)
>> everywhere. Oh, let's write inexact=?
>
> 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.
>
> This can generalise to inexact points in any metric space, and the
> like.
>
> -- hendrik
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