A real values function \(f\) is increasing in its domain. If \(x_{1}\geq x_{2}\) where \(x_{1},x_{2}\) are any two elements from the domain, then

\(f(x_{1})>f(x_{2})\) \(f(x_{1})\geq f(x_{2})\) \(f(x_{1})<f(x_{2})\) \(f(x_{1})\leq f(x_{2})\)

\(f(x_{1})\geq f(x_{2})\)

By definition