Math from Words

Chapter Four - The Ordered Pair

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S is not a set.

Elements in S are not required to be unique in S.

S contains exactly a pair of elements.

Each element in S is represented by a text item.

Element y, in S, is asymmetrically associated with element x, in S, and is next in order from that x, in S. Element X shall be recognized as *The First Element in S*, and element y shall be recognized as *The Last Element in S*.

If S is said to contain an element or elements of a given description, and that description is faulty, then S does not contain such elements or such an element.

S does not contain itself.

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