why is Convex function <= Concave function a valid cvx constraint?

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I am studying using CVX on MATLAB and encountering this problem that why is the following constraint: Convex function <= Concave function a valid CVX constraint?

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Erwin Kalvelagen On BEST ANSWER

Basically because if f is concave, then -f is convex. So say we have:

f(x) <= g(x)      with f convex, and g concave

then that means

f(x)-g(x) <= 0    f-g is convex