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$$\begin{aligned} &\operatorname{L}\text{single} (A, B) = \operatorname*{min}x ∈ A, y ∈ B Dis (x, y) &\operatorname{L}\text{double} (A, B) = \operatorname*{max}x ∈ A, y ∈ B Dis (x, y) \\ &\operatorname{L}\text{average} (A, B) = \frac{\displaystyle\sumx∈ A, y∈ BDis (x, y)}{|A|⋅|B|}\\ &\operatorname{L}\text{centroid} (A, B) = Dis(\frac{\displaystyle\sumx∈ Ax}{|A|},\frac{\displaystyle\sumy∈ By}{|B|})\end{aligned}$$