Problemi della tradizione a stampa del "De substantia orbis" di Averroè
The Sermo de substantia orbis, or Discourse on the Substance of the Celestial Sphere, is a collection of cosmological and metaphysical questions by the Islamic philosopher Averroes (1126-1198), no longer extant in Arabic, but preserved in Latin and Hebrew translations (the latter with the title Ma’amar be-‘Eṣem ha-Galgal).