[plt-scheme] Is there a set data-type?

From: Stevie Strickland (sstrickl at ccs.neu.edu)
Date: Fri Feb 5 11:40:00 EST 2010

On Feb 5, 2010, at 11:05 AM, Robby Findler wrote:
> You could use objects that have to implement various methods, member?,
> cardinality, union, enumerate (to debug; for infinite sets it would
> just stop after a while).

Which leads nicely to Cook's essay at Onward this past year:



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