Determine if the set is well defined or not well defined. The set of U.S. cities
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Polynomials are linear combinations of positive integer powers. For example,
is a polynomial, but
is not.
(In case you're unfamiliar with the term, a linear combination of two quantities is the sum of scaled versions of those quantities, e.g. a general linear combination of and
is
, where
are any numbers.)
is not a polynomial; the offending term is
, or
.