Georg Cantor Quotes
Every transfinite consistent multiplicity, that is, every transfinite set, must have a definite aleph as its cardinal number.
Cantor, Georg. Letter to Richard Dedekind. 28 July 1899. Printed in Georg Cantor Gesammelte Abhandlungen mathematischen und philosophischen Inhalts, edited by Ernst Zermelo, Julius Springer, 1932, p. 444.
Georg Ferdinand Ludwig Philipp Cantor was a German mathematician. He created set theory, which has become a fundamental theory in mathematics. Cantor established the importance of one-to-one correspondence between the members of two sets, defined infinite and well-ordered sets, and proved that the real numbers are more numerous than the natural numbers. In fact, Cantor's method of proof of this theorem implies the existence of an infinity of infinities. He defined the cardinal and ordinal numbers and their arithmetic. Cantor's work is of great philosophical interest, a fact he was well aware of.