{real affine} .* {convex}?The f(x1,x2) = a*x1*log(1+b*x2./(c*x1)) is a concave function or not? a>0,b>0,c>0

There is a question about “Cannot perform the operation:{real affine} .* {convex}

,”,how to deal with it?B、gain1,gain2,N0,D0,D1,D2,f0,f1, f2,C are constant and > 0。
Professional professor, I need your help very much。
@ Mark_L_Stone

x*log(1+y/x) can re reformulated as -rel_entr(x,x+y)

I will leave you to figure out what the x and y in your problem are.

it works thank you very much,you are my god! :smiling_face_with_three_hearts: