“We lay down a fundamental principle of generalization by abstraction: 'The existence of analogies between central features of various theories implies the existence of a general theory which underlies the particular theories and unifies them with respect to those central features....'” - Eliakim Hastings Moore (1862-1932) In H. Eves Mathematical Circles Revisited, Boston: Prindle, Weber and Schmidt, 1971 - American mathematician, professor.