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Eruvin Chart #15

Eruvin Daf 89a-90a

CARRYING MORE THAN FOUR AMOS ATOP A ROOF
  REBBI MEIR RABANAN
  (A)
RAV		 (B)
SHMUEL		 (C)
RAV 		(D)
SHMUEL
A SINGLE ROOF(1)
1) LARGER THAN A
BEIS SE'ASAYIM 		Mutar*(2) Asur(3) Mutar(2) Asur*(3)
2) BEIS SE'ASAYIM
OR SMALLER 		Mutar* Mutar(4) Mutar Mutar
MANY ROOFS
3) LARGER THAN A
BEIS SE'ASAYIM 		Mutar*(2) Asur(3) Asur(5) Mutar(6)
4) BEIS SE'ASAYIM
OR SMALLER 		Mutar* Mutar(4) Asur(5) Mutar(6)
==========
FOOTNOTES:
==========
(1) (Rebbi Meir and the Rabanan do not argue concerning a single roof, as is evident from the chart.)
(2) This is because the Mechitzos beneath the roof, around the house below, are considered to be enclosing the roof as well for residential purposes.
(3) This is because the Mechitzos beneath the roof, around the house below, are not considered to be enclosing the roof for the sake of residential purposes.
(4) Nevertheless, these roofs are considered a Karpaf and it is forbidden to carry from them to a Chatzer (TOSFOS DH v'Rav; this is the one case that RASHI (DH v'Rav) does not discuss this case).
(5) Rav's reason is because we do not apply the principle of Gud Asik to Mechitzos that are not discernible.
(6) Shmuel's reason is because we apply the principle of Gud Asik to Mechitzos that are not discernible (RASHI 90a, DH Hasam Leika, and 90b, DH v'Rav Aliba d'Rebbi Meir).

* The asterisks mark the cases addressed by the Gemara on 90b ("one should be permitted to carry from here to a Chatzer" and "one should be permitted to carry from here to a Karpaf").

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