Fraenkel Set Theory

Famous quotes containing the words set and/or theory:

“The moral earth, too, is round! The moral earth, too, has its antipodes! The antipodes, too, have their right to exist! There is still another world to be discovered—and more than one! Set sail, you philosophers!”
—Friedrich Nietzsche (1844–1900)

“The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals.”
—Thomas Henry Huxley (1825–95)