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zₙ) = sum(z₀, z₁, …, zₙ) and f(z) = √z. Euclidean distance can be calculated by parts Inner product is another example of such metric with aggregation functions h(z) = z, g(z₀, z₁, …, zₙ) = sum(z₀, z₁, …, zₙ) and f(z) = z. In the context of product quantization, this is a very important property