vault backup: 2026-02-27 11:44:44
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> A set is a collection of _unordered_ elements.
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> A set cannot contain duplicates.
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A set is a collection of _unordered_ elements.
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A set cannot contain duplicates.
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## Notation
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### Set Notation
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Declaration of a set $A$ with elements $a$, $b$, $c$:
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