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

1. Sets and potentially infinite sets aren't esoteric. We need them everywhere. 

2. For 10 elements? Use a list, Luke, use a list. 


On Feb 5, 2010, at 8:12 PM, Todd O'Bryan wrote:

> I feel like I started a tempest in a teapot.
> 
> I really just needed to check that an operation passed into a function
> (as a symbol) was one of the permitted operations. Roughly 10 members,
> but I didn't want to read through the list of all the operations each
> time I had to check. Thus, the question about (in my mind, finite)
> sets and my presumption that a hashtable would be a good
> representation.
> 
> Sorry for not asking a more specific question and encouraging all this
> discussion about much more esoteric topics than I had intended to. :-)
> 
> Todd
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