Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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To paraphrase Rudy Rucker:

"If the universe is science, and science is physics, and physics is mathematics, and mathematics is set theory, then EVERYTHING IS A SET."

Set theory is a branch of mathematics that is concerned with basic notions of objects belonging to sets.
Set theory provides a common foundation for many branches of mathematics.  Set theory in and of itself is mostly concerned with infinite sets, and the concept of infinity.

Concepts in set theory: union, intersection, subset, complement