| http://www.w3.org/ns/prov#value | - Approach<http://www.amazon.com/Mathematica%C2%AE-Problem-Centered-Approach-Undergraduate-Mathematics/dp/1849962502/ref=sr_1_2?ie=UTF8&qid=1309181549&sr=8-2>. I have a problem I would like to know if there is a more elegant solution. I would think involving set theory, but I can not seem to (embarrassingly) find it.
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