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Reference.org
Combinatorial class
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a combinatorial class is a <a href="/facts/Countable_set/Wj4DmWPv">countable set</a> of mathematical objects, together with a size function mapping each object to a non-negative integer, such that there are finitely many objects of each size. </p>