   All histories of Jewish philosophy include an entry on Abraham Ibn Ezra, and, judging from his impact on the field, he certainly deserves the recognition that he has received. Just how he earned it, however, poses a difficult historical problem. Ibn Ezra contributed virtually nothing to any of the branches of philosophy; he authored little in the way of strictly philosophical tracts and, indeed, there is no reason for us to suppose that he enjoyed any rigorous training in philosophy.  Yet he certainly left his mark on Jewish thought, and his pronouncements are recorded and treated with respect by those who came after him.