The inequality is one of my constrain.How can I write the inequality?

two variables are both marked yellow.

Thank you for your help !

It is not convex generally, so it cann’t be done. But if a > b>0, p>0, t>0,Q>0, then yes, the `log()-log()`

stuff is concave and can be expressed with a `rel_entr()`

, t will be on the right hand side of the inequality and becomes `Q*inv_pos(t)`

. For details about using them, you can check http://web.cvxr.com/cvx/doc/funcref.html

Thank you very much!

I will have a try.

if I add a variable which is marked green,how can I deal with it ?(three variables ,it is marked green and yellow)

I have a try，as shown in the following picture, but the first expression l/t seems not concave.

Not everything in the world is convex. I don’t know this one. This book https://docs.mosek.com/modeling-cookbook/index.html might help. By the way, please show your complete formulated problem if you don’t mind. Other **true** experts here might help you.

it’s OK ,and thank you again!