13th CYCLE DEDICATIONS:

ERUVIN 90 (28 Sivan) - Dedicated in memory of Hagaon Rav Yisroel Zev (ben Rav Avrohom Tzvi) Gustman, zt"l, Rosh Yeshiva of Yeshivas Netzach Yisrael-Ramailes (Vilna-Brooklyn-Yerushalayim), author of "Kuntresei Shi'urim" and renowned Dayan in pre-war and post-war Vilna, on his Yahrzeit. Dedicated by Harav Avraham Feldman of Yerushalayim, Dr. Yehoshua Daniel of Efrat, and Rabbis Eliezer and Zalman Stern of New York, who merited to study under the Rosh Yeshiva zt"l in Yerushalayim.
 
12TH CYCLE DEDICATIONS:
 
ERUVIN 90 (3 Teves) - the Dafyomi material for today has been dedicated in memory of Hagaon Rav Yisroel Zev Gustman Ztz"L (author of "Kuntresei Shiurim") and his wife, Rebbetzin Sarah Gustman (daughter of Hagaon Rav Meir Bassin, a Dayan in Vilna) in honor of the day of the Yahrzeit of the Rebbetzin. Sponsored by a number of Rav Gustman's Talmidim (Yechiel Wachtel, Michael Starr and Mordecai Kornfeld).

Eruvin Chart #15

Chart for 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)
-------------------------------------------------

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FOOTNOTES:

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(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").

OTHER D.A.F. RESOURCES ON THIS DAF