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1) HALACHAH: THE SIZE OF A "SHIYUR"
Tana'im argue, in our Mishnah, as to the number of houses that have to be left out of an Eruv in an Ir Shel Rabim: 50 residents (Rebbi Yehudah), or 3 courtyards with 2 houses each (Rebbi Shimon). The Gemara records another opinion, that of Rebbi Yitzchak: A single courtyard occupied by but a single house. What is the Halachic ruling on this matter, and how is it practiced today, when making an Eruv for a city?(a) TOSFOS (DH Gemara) rules in accordance with Rebbi Shimon, since the Gemara explicitly states that his opinion is the Halachic one. Furthermore, it is apparent from Abaye's question that Rebbi Yitzchak is only an Amora, and certainly cannot argue Halachically with Rebbi Shimon. That is why Abaye wanted to know whether Rebbi Yitzchak's statement was based on a tradition, or on logic. If it was based on tradition, there is another opinion among the Tana'im in this matter which ought to be recorded (even if it is not the Halachic one), while if it is a logical proposition, he is simply saying, "*I* would have thought that one house can also be a Shiyur -- but now that I see the Tana'im rule otherwise, my opinion does not matter." (Tosfos DH Gemara)HALACHAH: The consensus of the Poskim is like the Rif, that a courtyard with one house suffices (OC 392:1). However, even though we commonly make a Tzuras ha'Pesach, along with an Eruv Chatzeros/Shituf Mavo'os around entire cities, it was not common practice to leave a Shiyur. Why don't we leave a Shiyur?
60b2) WHEN A "TECHUM" ENDS IN THE "IBUR" OF A CITY
QUESTION: The Gemara diffentiates between a situation when the 2,000 Amos that one may walk on Shabbos ends in *middle* of a neighboring city, and when it ends at the *end* of the city. In the former situation, one may not take a step past 2,000 Amos; the city is not judged to be "but 4 Amos." In the latter situation, the entire city does not count as more than 4 Amos.Next daf
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