;
: Th. Closed under union, concatenation, and Kleene closure. ;
: Th. Closed under complementation: If L is regular, then is regular. ;
: Th. Intersection: .
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Mathematics
No, it does have 3 sets of parallel sides though.
No, because equivalent sets are sets that have the SAME cardinality but equal sets are sets that all their elements are precisely the SAME. example: A={a,b,c} and B={1,2,3} equivalent sets C={1,2,3} and D={1,2,3} equal sets
3,4,5 1,2,3 these are sets of pythagorean triples
Closure