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1 You can prove this fact by evaluating a double integral, but we shall not do the math here, as it is not central to the dis-
cussion.
2 This space would not be Euclidean, of course, but the principles regarding hierarchical clustering carry over, with
some modifications, to non-Euclidean clustering.
3 Do not forget that the term “cluster” has two completely different meanings in this section.
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