a*log(1+b/a)>c
a,b,c are all positive variables，can this constraint be expressed in CVX？
-rel_entr(a,a+b) >= c
CVX will treat > as being >=. So if you need strict inequality, you should change it to -rel_entr(a,a+b) >= c + small_positive_number, where small_positive_number is perhaps 1e-5 or 1e-6.
Thank you sir, I wanna ask you about another expression
can log(1+c1g/(c2g+c3)) be expressed in CVX?
where g is variable