Ultrametric A metric is an ultrametric if it satisfies the following stronger version of the triangle inequality: for all x, y, z in M, d(x, z) ≤ max(d(x, y), d(y, z)).
Ultrametric A metric is an ultrametric if it satisfies the following stronger version of the triangle inequality: for all x, y, z in M, d(x z) ≤ max(d(x y), d(y z)).