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This tag is for elementary questions on set theory, spanning topics usually found in introductory courses in set theory, in addition to review sections of graduate textbooks in the same field. Topics include intersections and unions, de Morgan's laws, Venn diagrams, relations, functions, (un)countability, power sets, transfinite induction, well orders, ordinal and cardinal arithmetic, etc. More advanced topics should use the "set-theory" tag instead.

This tag is for elementary questions on set theory, focusing on material usually covered in undergraduate set theory texts. More advanced topics should use the tag instead. Topics include intersections and unions, de Morgan's laws, Venn diagrams, relations, functions, countability and uncountability, power sets, transfinite induction, well-orders, ordinal and cardinal arithmetic, etc.

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