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{{Short description|Shape descriptions in a geometrical/topological sense}}
{{Use dmy dates|date=July 2022}}
'''Size functions''' are shape descriptors, in a geometrical/topological sense. They are functions from the half-plane <math>x<y</math> to the natural numbers, counting certain [[Connected component (topology)|connected component]]s of a [[topological space]]. They are used in [[pattern recognition]] and [[topology]].
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