J. R. Boyd has written:

'Introduction to elementary point set theory' -- subject(s): Set theory

Marian Hortense Covington has written:

'Content and measure of point sets ..' -- subject(s): Set theory, Number theory

Classical theory is a reference to established theory. Fuzzy set theory is a reference to theories that are not widely accepted.

Set theory was founded by Georg Cantor in 1873.

Set theory is the mathematical study of sets. Set theory in business is important because it assists with the operations and planning in a business.