Commentary for Eruvin 9:12

ורב יוסף דפתח ליה בקרן זוית

unless houses and courtyards open out into it'.<span class="x" onmousemove="('comment',' Sc. the houses open out into the courtyards and the latter into the alley (Rashi) .');">⁴⁸</span> Now if [a strip of the width] of four [handbreadths were to constitute a proper alley wall) how could this<span class="x" onmousemove="('comment',' That 'courtyards' should open out into it'?');">⁴⁹</span> be possible?<span class="x" onmousemove="('comment',' The prescribed minimum width of a door being four handbreadths, the doorway of one courtyard alone would cover the full width of the alley wall.');">⁵⁰</span> And should you reply that the doors might open<span class="x" onmousemove="('comment',' Lit., 'that he opens it'.');">⁵¹</span> in the middle wall,<span class="x" onmousemove="('comment',' The back wall of the alley which is enclosed by the two side walls. While the latter might be as narrow as four handbreadths the former might be long enough to admit of more than one courtyard door.');">⁵²</span>

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