The number 1 is a basic numerical value that represents a single unit or a single whole. It is the first positive integer and is often used as a foundational element in mathematics. In various contexts, 1 can denote unity, identity, or singularity. For example: - In arithmetic, it is the multiplicative identity, meaning any number multiplied by 1 remains unchanged. - In set theory, a set with one element has a cardinality of 1.
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