Rabbi Gershon West: Brachos 47A: Tanu Rabanan Ayn Onin… (11/04/2014)
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Begin on 47a, at the two dots halfway down the amud, tanu rabanan ayn onin. Learn until the two dots ten lines from the bottom, maaser rishon. See Rashi and tosfos dh amen, dh kol and dh ilu. Regarding Rashi and Tosfos’s question about amen yesomah from Alexandria, see Rabeinu Yonah on 34B dh ayn onen that says another answer to this question. See Rambam hilchos brachos perek 1 halacha 14 that alludes to an answer to this question. See Chidushei Reb Aryeh Leib cheilek 1 siman 5, specifically dh venireh dezeh, that explains the Rambam. On the gemara Rav and Shmuel that one can be mitztaref to a zimun as long as the two original members are still able to eat, is this a chiyuv zimun or a reshus? See Rashi dh achilnah and the first three lines of the first Rabeinu Yonah in the perek (32a dh shlosha). See also Biur halacha siman 197 sif 1 dh mitzaref.
