Reply To: Chidushim on Daf Yomi

The Rashba in Rosh Hashanah 15,1 asks the question, how could the chazal make a gezara to eliminate shofar on Shabbos when the Torah says to blow? He answers that baal tigra (diminish) does not apply to the chachomim. Does he argue on the Rambam above? As the first day sukkos is the only biblical mitzva. of lulav, did chazal remove the the biblical mitzva completely if it falls on shabbos? The Taz YD 117, says that if a mitzva is specified to do it even on shabbos, they cannot remove it. From the pasuk it looks like we should take the lulav on the first day even it falls on shabbos. They ask a question why do we asser on shabbos to blow shofar because of carrying and not because of making music? They answer that then they would eliminate shofar completely on both days.