The problem of logical colleges

This research represents a central issue in ancient Greek thought, resulting from the debate with the sophists, and its echo resonated in Plato's dialogues and Aristotle's logical writings, and it is considered the most complex problems of the Middle Ages. The problem of the universal expresses a philosophical and cognitive issue more than its expression of the ontological existential problem, so universals have been employed in Christian theology among the Christians, as well as in theological doctrines among Muslims.