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1)

(a) Rav (who is considered a Tana) disagrees with the Beraisa quoted abov,e that permits a Mavoy which has only one Chatzer, in which only one man and his son live.

(b) The two Chatzeros do not need to flank the Mavoy; it will suffice for both of them to be on the same side.

(c) A Mavoy is not be rectifiable by a Lechi or Koreh - even though it has two Chatzeros, each of which has two houses leading into it - when the two Chatzeros do not require an Eruv, or even if they do, when the Eruv can be made without the Mavoy - such as in the above case, when the courtyards open into each other.

(a) Rebbi Yochanan does not even require a house. According to him, even a Chatzer on one side and a ruin on the other is also sufficient to permit a Mavoy with a Lechi or a Koreh.

(b) A pathway through a vineyard however, which is not habitable, will not suffice.

(a) An Eruv Chatzeros is needed to combine two Chatzeros, according to Rebbi Shimon - to permit carrying from a house in one Chatzer to the other Chatzer (or vice-versa).

(b) Rav is worried that, if we rule like Rebbi Shimon even when the Chatzeros made their own individual Eruvin, then people will take advantage of the fact that they are now permitted to carry from their house to the Chatzer, and carry from their Chatzer into the next one.

(c) Just as Rebbi Yochanan does not decree (like Rav does) that one may come to carry the vessels from one's house to the Chatzer, and from the Chatzer into the next Chatzer, so too he permits placing a Lechi or Koreh on the basis of a Chatzer on one side and a ruin on the other - and is not concerned that one may carry from the Chatzer to the ruin via the Mavoy (even though this is forbidden, since the owner of the ruin did not combine in the Eruv).

(a) Rav Elazar Bar Bei Rav queried Shmuel's ruling, permitting a Mavoy with one Chatzer plus one house, from our Mishnah 'she*'ha'Mavoy la'Chatzeros, ke'Chatzer le'Batim'* - which implies that a Mavoy requires at least two Chatzeros and each Chatzer at least two houses, particularly since Shmuel himself was the one to say that when it comes to Eruvin, we follow the exact Lashon of the Mishnah?

(b) Shmuel put up a Lechi at the entrance of the Mavoy where Eivus bar Ihi lived.

5)

(a) After Shmuel's death, Rav Anan took down Shmuel's Lechi.

(b) Initially, we ascribes Rav Anan's action to the fact that he held like Rav, who requires at least *two* Chatzeros each with *two* houses, whereas Eivus bar Ihi lived alone in the Chatzer - this proves that Shmuel, who put up the Lechi, did not retract - in spite of Rav Elazar Bar Bei Rav's Kashya.

(c) The Gemara concludes that Shmuel put up the Lechi - because in Shmuel's day, the Shamash used to sleep in the area of the Shul that was attached to the Mavoy, giving it the Din of an additional Chatzer - and Shmuel holds 'Makom Linah Garim', as we learnt above (73a). Consequently, there were *two* Chazteros, not just one (so we have no proof that Shmuel did not retract from his original atatement). (Note: It is not however clear, what we will do with the fact that there seems to have been only *one* house in each Chatzer - see Ritva.)

(a) Rav Anan took down the Lechi - because in his time, the Shamash no longer slept there.

(b) Eivus bar Ihi held 'Makom Pita Garim' (like Rav) - so he thought that Shmuel put up the Lechi because he held that a Mavoy requires only one Chatzer and one house like Shmuel held initially.

(a) When Rav Yehudah quoting Rav, forbids making an Eruv in a Mavoy that is flanked by a Jew (whom we shall call Reuven) on one side and a gentile on the other - he is speaking about when other Jews live in houses adjoining Reuven's. Their houses lead on to a Reshus ha'Rabim on the far side, and their windows open from one to the other; they now wish to make an Eruv to enable them to carry from *their* houses to the Mavoy via *Reuven's*.

(b) If Rav's Din was confined to a Mavoy (but not a Chatzer that is shared by a Jew and a gentile) - his reason for forbidding it would be because a Mavoy cannot be permitted by a Lechi or a Koreh unless there are at least *two* Chatzeros, each with two houses, opening into it.

(c) Rav needs to repeat the Halachah *here* - because otherwise, we would have said that the dwelling of a non-Jew is considered a dwelling, in which case, there will indeed be two Chatzeros, one of Reuven, and the other of the non-Jew; each with two houses opening into it, because there could have been more than one non-Jew residing in that Chatzer.

(d) On the other hand, had Rav told us the Din only here, we would not have known how many houses each Chatzer requires, therefore he needs to present his other statement, which explicitly mentions *two* houses to each Chatzer.

(a) According to Rav Yosef, who holds that Rav forbids making an Eruv even in a *Chatzer* when only a gentile shares it with him - Rav's reason is because it is forbidden to share a Chatzer alone with a gentile.

(b) Rebbi Tivla mentioned 'Akum' twice - either because he was speaking about a Chatzer, which (unlike by a Mavoy, which is forbidden even if it is shared by just one Jew), Rav forbids only because it is a gentile who is sharing it with him; or he mentioned one Akum because Rav forbids it by a Mavoy, and the other, because he also forbids it by a Chatzer.