
is a signomial. The term `signomial` was introduced by Richard J. Duffin and Elmor L. Peterson in their seminal joint work on general algebraic optimization—published in the late 1960s and early 1970s. A recent introductory exposition is optimization problems. Although nonlinear optimization problems with constraints and/or objectives defined .....
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http://en.wikipedia.org/wiki/Signomial

The difference between two posynomials. This class of function defines the general geometric program.
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http://glossary.computing.society.informs.org/index.php?page=S.html
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