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odd numbers greater than 1 but less than 5.
No, it is imaginary. Irrational numbers are a subset of real numbers Real numbers and imaginary numbers are sets without any overlap.
A collection of distinct entities regarded as a unit, being either individually specified or (more usually) satisfying specified conditions.
Closed sets and open sets, or finite and infinite sets.
Undecagon- an eleven-sided polygonUnion of two sets A and B- the set of elements in A, B, or both; written AUBUnit cube- unit of measuring volumeUniversal statement- a conditional that uses the words 'all' or 'everything'Universe- in a Venn diagram, everything that is outside the sets