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Kollel Iyun Hadaf, Jerusalem
1) Rebbi Yochanan rules 'Socher ki'Mevatel Reshus Dami', inasmuch as one can hire the gentile's Reshus - even on Shabbos. On the other hand, he holds 'Socher ki'Me'arev Dami' in three regards: that one does not require a Shaveh Perutah, that it can be done even through the gentile's 'worker' (Sechiro u'Lekito). What is the third ramification of 'Socher ki'Me'arev Dami'?
(a) Shmuel made a three part statement: 'Kol Makom she'Osrin u'Me'arvin - Mevatlin; Me'arvin ve'Ein Osrin, Osrin ve'Ein Me'arvin, Ein Mevatlin'. What does 'Kol Makom she'Osrin u'Me'arvin - Mevatlin' mean, and to which case does it refer?
(a) What prompted Abaye to say (quite often) to Rav Yosef 'At Amrat Nehelan, ve'Ha Amrat Nehelan'?4) 've'Ein Bitul Reshus be'Churvah'.
What does this mean? What is a Churvah?
5) If Shmuel did not say 'Ein Lanu be'Eruvin Ela ki'Leshon Mishnaseinu' in connection with 'Anshei Chatzer', *ve'Lo Anshei Chatzeros* (which Rav Yosef initially thought Shmuel had said), then in connection with which Mishnah *did* he say it?
(a) We quoted Shmuel, who says 'Ein Bitul Reshus me'Chatzer le'Chatzer, ve'Ein Bitul Reshus be'Churvah'.7)
(a) Rava says that even in a case of one courtyard within the other, Bitul only helps sometimes. If they placed the Eruv in the *outer* Chatzer, and one of the residents of either Chatzer forgot to participate in the Eruv, they are both forbidden to carry from their respective houses into the Chatzer.8)
(a) In which case then, does Rava agree that Bitul Reshus is effective?9) The above goes according to the Chachamim, but not according to Rebbi Eliezer, in whose opinion even the Bitul Reshus of one of the inner residents helps.
Why is that? What does Rebbi Eliezer say?