posynomial

Noun

• A function of the form $f(x\_1,\; x\_2,\; \backslash dots,\; x\_n)\; =\; \backslash sum\_\{k=1\}^K\; c\_k\; x\_1^\{a\_\{1k\}\}\; \backslash cdots\; x\_n^\{a\_\{nk\}\}$, where all the coordinates $x\_i$ and coefficients $c\_k$ are positive real number, and the exponents $a\_\{ik\}$ are real numbers.