Commentary for Eruvin 178:8

א"ל אנא הכי אמרי לכו ל"ש אלא שיש מחיצה על זה ומחיצה על זה דגדול מישתרי בגיפופי וקטן נפרץ במלואו אבל אין מחיצה לא על זה ולא על זה שניהן אסורין

is<span class="x" onmousemove="('comment',' Even according to Rab's view.');">¹⁸</span> permitted,<span class="x" onmousemove="('comment',' Since three of its sides (cf. Supra n. 16) are detached and defined and the principle of upward extension may well be applied to them, while, on its fourth side, the part which is joined to the smaller roof may be regarded as a doorway and the two sections projecting on either side may be deemed to be extending upwards and forming a kind of railings or side-posts to the two sides of the doorway. The two roofs thus assume the character of two courtyards with a door between them where the smaller one imposes no restrictions on the bigger.');">¹⁹</span> and the use of the smaller one is forbidden.<span class="x" onmousemove="('comment',' Being exposed to the extent of the entire length of one of its sides to the bigger roof that side cannot be regarded as a door but as a breach, on account of which the people of the bigger roof (as in the case of a similar breach between a bigger, and smaller courtyard) impose restrictions on its use.');">²⁰</span>

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