Abba ben Joseph bar Ḥama
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Abba ben Joseph bar Ḥama also known as Rava was a Jewish Talmudist who lived in Babylonia, known as an amora, born in 270. He is one of the most often-cited Rabbis in the Talmud. He studied at the Talmudical Academy at Pumbedita. There he became famous for his debates with his study-partner Abaye. The debates between Abba ben Joseph and Abaye are considered classic examples of Talmudic dialectical logic. Of their hundreds of recorded disputes, the law is decided according to the opinion of Abba ben Joseph in all but six cases.
When Rabbah bar Nahmani (not to be confused with Abba ben Joseph), the head of the yeshiva of Pumbedita, retired, the position went to Abaye. At that point, Abba ben Joseph returned to Mahuza, in Babylonia, where he established a yeshiva there. After the death of Abaye, many of his students moved from Pumbedita to Mahuza, to join Abba ben Joseph's Yeshiva, which had become one of the intellectual centers of the Babylonian Jewish Community. Rava died in 350.