Isagoge

The Introduction ( "Isagoge") to the Categories of Aristotle, Written by the Greek scholar and neoplatonist Porphyry in the third century A.D., was translated into Latin by Boetius, and in this form was extensively used throughout the Middle Ages as a compendium of Aristotelian logic.

Historia Calamitatum: The Story of My Misfortunes 1922

Porphyry, writing in his "Isagoge" regarding universals, dared not attempt a final pronouncement thereon, saying rather: "This is the deepest of all problems of its kind."

Historia Calamitatum: The Story of My Misfortunes 1922

"Isagoge" had extraordinary weight among the medieval logicians.

Historia Calamitatum: The Story of My Misfortunes 1922

"Isagoge", and Boethius's translation of portions of Aristotle's

The Catholic Encyclopedia, Volume 10: Mass Music-Newman 1840-1916 1913

Old Logic: Porphyry, "Isagoge" (Introduction to the Categoriae);

The Catholic Encyclopedia, Volume 1: Aachen-Assize 1840-1916 1913

It did not grow up spontaneously in the Middle Ages; it was bequeathed in a text of porphyry's "Isagoge", a text that seemed simple and innocent, though somewhat obscure, but one which force of circumstances made the necessary starting-point of the earliest medieval speculations about the Universals.

The Catholic Encyclopedia, Volume 11: New Mexico-Philip 1840-1916 1913

Moreover, Porphyry, after proposing his triple interrogation in the "Isagoge", refuses to offer an answer (dicere recusabo).

The Catholic Encyclopedia, Volume 11: New Mexico-Philip 1840-1916 1913

His most important original treatises on logic are "De Universalibus", in which he goes over the ground covered by Porphyry in the "Isagoge", and "Grammatica Speculativa".

The Catholic Encyclopedia, Volume 9: Laprade-Mass Liturgy 1840-1916 1913

The work immediately took its place as a scholastic textbook, side by side with the "Isagoge" and the

The Catholic Encyclopedia, Volume 6: Fathers of the Church-Gregory XI 1840-1916 1913

It is largely a summary of the Categories of Aristotle with Porphyry's "Isagoge" (Eisagoge eis tas kategorias).

The Catholic Encyclopedia, Volume 8: Infamy-Lapparent 1840-1916 1913