How to write f(x,y1,y2,p,q) = x^4 / ((y1 + y2) * p * log(1+q)) in CVX

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What are the optimization variables? If all of x,y1,y2,p,q are optimization variables, that is neither convex nor concave. Perhaps your calculations are erroneous.

Edit: @LeoTree See @jackfsuia 's and my posts below for an important “clarification” to this post.