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Re: circular <= shared
iirc, Al Petrofsky posted an algorithm that detects circularities
without also catching sharing. It has higher computational complexity
and is harder to implement than detecting all sharing.
Numbers are not interesting (in the sense of the (interesting?)
subfunction in the reference implementation), because they may
have an (eq?) relationship whenever they are (eqv?).
Just to clarify, I was referring to a *different* Al Petrofsky
algorithm, not the one you included in this srfi. The one in the srfi
does sharing (as you say, some further investigation is needed to check
what kind of sharing it detects), the one I'm referring to detects