 The final result of Wyclif’s revolution is therefore an incomplete system of intensional logic, which he superimposes on the standard extensional system inherited from Aristotle. As a result, the copula of the philosophical propositions that are dealt with cannot be extensionally interpreted, since it does not properly mean that a given object is a member of a certain set or that a given set is included in another; rather it means degrees of identity. Only in virtue of renouncing any extensional approach to the matter were Wyclif’s followers able to give a logically satisfactory solution of the problem of the relationship between universals and individuals, which had always been the most difficult issue for medieval Realists.