Concept

real value function 𝑓 is unimodal on [𝑎,𝑏] if there is unique 𝑥 such that 𝑓(𝑥) is minimum of 𝑓 on [𝑎,𝑏] and 𝑓 is strictly decreasing for 𝑥𝑥 and strictly increasing for 𝑥𝑥.