Abraham bar Hiyya Ha-Nasi

Abraham bar Hiyya Hanassi

Abraham bar Hiyya Hanassi (אברהם בר חייא הנשיא, Abraham fils de [Rabbi] Hiyya "le Prince") (1070-1136) est un rabbin, mathématicien, astronome et philosophe, également connu sous le nom de Savasorda (de l'Arabe صاحب الشرطة Sâhib ash-Shurta "Chef de la Garde"). Il est né à Barcelone (Espagne) et est mort en Provence (France). Il vécut principalement à Barcelone.

Il diffusa l'équation du second degré en Occident, en des temps troublés où le savoir voyageait peu.

Il est également auteur de Higayon haNefesh (Logique de l'âme) et Meguilat HaMegualè (Le Rouleau du Révélateur), premiers ouvrages philosophiques rédigés en hébreu, bien que la théologie, l'eschatologie et l'éthique y soient plus abordés que la philosophie proprement dite.

Sa pensée emprunte à Aristote autant qu'à Plotin. Ainsi, il souscrit à la doctrine émanationniste, mais intercale un monde de lumière et un monde de domination entre Dieu et les substances spirituelles. Ses conceptions de forme et matière sont, quant à elles, aristotéliciennes, car ces principes ne peuvent exister que dans le monde corporel et non dans celui des substances simples.

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