Previous daf

1)

(a) Rami bar Chama asked whether, if a roof is side by side with a column, both of which are ten Tefachim tall and four Tefachim square, one may carry two Tefachim on the one and two Tefachim on the other.
Like whom must he hold to ask such a Sha'aleh?

(b) Why was Rami bar Chama careless to pose the Sha'aleh such a Sha'aleh?

(c) His Sha'aleh should really have concerned carrying from the roof of a house to that of a porch.
What exactly, would the Sha'aleh then be? What may be the two possible reasons of the Rabbanan, who forbid carrying from one roof to another, and how will this determine the Sha'aleh?

(d) In light of the previous Sha'aleh, how does Rav Bibi bar Abaye justify his Sha'aleh with regard to carrying from a roof to a ruin? Why are they not one and the same Sha'aleh?

(a) Rebbi Meir in our Mishnah considers all roofs to be one Reshus; whereas according to the Rabbanan, each one is its own Reshus. Rav takes this literally to mean that one can carry on all the roofs, or on each roof any distance (provided they are not more than a Beis Sasayim).
How does Shmuel explain the two opinions?

(b) How does Shmuel explain Rebbi Meir, who says 'Reshus Achas le'Chulan'?
In what respect are they considered *one* Reshus?

(c) How does Rav's opinion here appear to clash with his own opinion earlier on the previous Daf, with regard to the owners forbidding each other to carry from one roof to the other?

(d) How do we reconcile Rav here with his opinion there?

(a) By the same token, how do we reconcile Shmuel here with his opinion there, where he permits carrying on all the roofs, according to the Rabbanan? Why does he forbid it here?

(b) But surely the houses are Hukaf le'Dirah? So why should carrying be forbidden on the rooftops?

(a) Rav permits carrying in a boat that is more than a Beis Sasayim, because, he argues, it is Hukaf le'Dirah.
Why does Shmuel disagree?

(b) What did Shmuel reply when they asked him whether the Halachah is like him or like Rav?

5)

(a) Even Rav agrees that if the boat is overturned, one is restricted to four Amos.
Why was the boat overturned? What will the Din be if it overturned for different reasons?

(b) Rav Ashi quotes the Machlokes between Rav and Shmuel by a boat (as we just learnt). In what connection does Rav Acha b'rei de'Rava quote it? What is the basis of their Machlokes?

(a) The Gemara asks that, according to Rav (who permits carrying even more than four Amos on a roof - according to Rebbi Meir), why does Rebbi Meir not permit carrying from a roof-top to a courtyard.
Why indeed does he not?

(b) Why does the Gemara confine its Kashya on Rav to the opinion of Rebbi Meir, why not according to that of the Rabbanan too?

(c) Why does the Gemara only ask on Rav? Why does it not ask on Shmuel too?

(a) The Gemara then asks on Shmuel (in whose opinion we do not say 'Gud Acheis Mechitzos' - in the above Sugya): why do the Rabbanan not permit carrying from a single roof-top to an enclosure.
What do the Rabbanan actually say in this regard?

(b) What does the Gemara answer?

(c) Why does the Gemara confine its Kashya on Shmuel to the Rabbanan? Why did it not ask the same Kashya even according to Rebbi Meir, since both are considered a Karmelis - according to Shmuel?

(d) Why does the Gemara ask only on Shmuel, and not on Rav?

(a) According to Rav (who considers a single roof a Reshus ha'Yachid), why may one not carry from a roof to a *small* enclosure according to the Rabbanan, or from a Chatzer to a Karfaf even according to Rebbi Meir, which is less than a Beis Sasayim?

(b) Then why may one carry from the Chatzer to the roof?

(c) Why does the Gemara not ask on Rav (who considers a series of roofs a Karmelis according to the Rabbanan), why then, according to them, is one not permitted to carry from them to an enclosure (which is more than a Beis Sasayim)?

(d) Why indeed does Rav not consider the roofs a full Karmelis, to carry from them into a ruin or a porch or an enclosure?