Commentary for Eruvin 188:10

כדאמרי בי רב משמיה דרב כגון שנפרץ בקרן זוית וקירויו באלכסון הכא נמי כגון שנפרץ בקרן זוית וקירויו בארבע

- This is no difficulty: He does not uphold the principle<span class="x" onmousemove="('comment',' Of the downward extension of a ceiling.');">¹⁵</span> in respect of four walls<span class="x" onmousemove="('comment',' Sc. where the ceiling has to supply the place of four walls, as is the case in an exedra that has only a roof resting on poles.');">¹⁶</span>

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