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How to define reflexivity, symmetry and transitivity of relations?
A, B are elements belonging to a set, and R is a relationship, so there are:

1 reflexivity-that is, every element A in the set has aRa.

2 symmetry-that is, for any element ARB in the set, ARB holds if and only if bRa holds.

3 transitivity-that is, for any element abc in the set, if aRb and bRc hold, then aRc must hold.

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