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

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Fri Feb 5 09:12:23 EST 2010

On Feb 5, 2010, at 8:29 AM, Todd O'Bryan wrote:

> What do people use for a set data-type? If there isn't one built-in,
> we're going to use a hash-table with #t as all the values.

Just a tease: how would you use hashtable to represent infinite sets? 

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