Study Eruvin folio 8A with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
And with regard to what first entered our minds, that Rav and Shmuel disagree both in the case where the residents of the alleyway and the residents of the yard established an eiruv together, as well as in the case where they did not establish an eiruv together, explanation is necessary. The Talmud
The Talmud explains: In the case where they did not establish a joint eiruv, Rav and Shmuel disagree concerning the halakha governing an alleyway that appears closed from the outside. Outside the alleyway there is a wider courtyard, so that from the perspective of those standing in the courtyard,
And in the case where they established a joint eiruv, they disagree about the principle stated by Rav Yosef. For Rav Yosef said: The allowance to carry in an alleyway that terminates in a backyard was only taught in a case where the alleyway terminates in the middle of the backyard, so that when v
Rabba took the discussion one step further and said: That which you say: Where the alleyway terminates in the middle of the backyard, carrying is permitted, this was only stated with regard to a case where the breach in the back wall of the alleyway into the yard and the breach in the facing wall
Rav Mesharshiya continued this line of thought and said: That which you say: If the two breaches are not opposite one another, carrying within the alleyway is permitted, this was only stated with regard to the case where the backyard belongs to many people. But if the yard belongs to a single ind