Occam, Ockam was also a Franciscan philosopher English 14th century, defender of nominalism and very critical with the earlier philosophers of the scholastic above all in the matter of universal concepts. He formulated the principle of economy then called " razor of Ockham " in Anglo-Saxon cultural principle of parsimony that says: " we must not multiply entities without " i.e., the facts must be explained in the simplest way.
