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This document discusses sets and subsets. It defines empty sets, finite sets, infinite sets, equality of sets, subsets, disjoint sets, and Venn diagrams. Specifically, it provides examples of equal sets A=B=C, finite set B=R, infinite sets A=Y, equal unions T=U=T=M=H=M=H. It also gives subsets T⊂S⊂J, set of sets A=B, disjoint sets 1≠2 and X≠Y, and Venn diagrams showing disjoint and non-disjoint sets.













