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<p>the [[Opus Majus]], contains treatments of <a href="page.php?w=mathematics">mathematics</a>, <a href="page.php?w=optics">optics</a>, <a href="page.php?w=alchemy">alchemy</a>, and <a href="page.php?w=astronomy">astronomy</a>, including theories on the positions and sizes of the <a href="page.php?w=celestial_bodies">celestial bodies</a>. It is divided into seven sections: "The Four General Causes of Human Ignorance" (Causae Erroris), "The Affinity of Philosophy with Theology" (Philosophiae cum Theologia Affinitas), "On the Usefulness of Grammar"</p><p>
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