I want to express , where x y and z are optimization variables, and a b c are constants.

Assuming a,b,\ldots x, y, \ldots are all positive then t\geq \frac{1}{x^ay^b\cdots} is equivalent with \log(t)+a\log(x)+b\log(y)+\cdots\geq 0.

If a,b,\ldots are natural numbers then you could also use `geo_mean`

or `prod_inv`

.

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Thank you for your answer, it totally solved my problem。o(*￣▽￣*)ブ