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Let Z be a set of fat points in P^1 x P^1 that is also arithmeticallyCohen-Macaulay (ACM). We describe how to compute the degree of a separator of afat point of multiplicity m for each point in the support of Z using only anumerical description of Z. Our formula extends the case of reduced pointswhich was previously known.

Separators of Arithmetically Cohen-Macaulay fat points in P^1 x P^1