thumb|x R y defined by xinteger division|//4≤y//4 is a preorder on the [[natural numbers. It corresponds to the equivalence relation x E y defined by x//4=y//4. The set of equivalence classes is partially ordered, and thus can be shown as a Hasse diagram (depicted).]]
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- Subclass of
- transitive relation
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- WikiProject Mathematics
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- order theory
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