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then <math>f(x) = \sum_{k=1}^K e^{a_K^T y + b_k}</math>, where <math>a_k = (a_{1k},\dots,a_{nk} )</math> and <math>b_k = \log{c_k} </math>. After the change of variables, a posynomial becomes a sum of exponentials of affine functions.
[[Category:Optimization]]
==External links==
* S. Boyd, S. J. Kim, L. Vandenberghe, and A. Hassibi, [http://www.stanford.edu/~boyd/gp_tutorial.html A Tutorial on Geometric Programming]
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