Commentary for Eruvin 178:13

אמר רבא פעמים שהדקה לאיסור היכי דמי דעבידא להדי תרביצא דביתיה דאמר

while [the smaller one is forbidden, since] it has a breach along its full side, but if there was a partition suitable for a dwelling-place on the bigger roof and none that was fit for a dwelling-place on the smaller one, even the use of the smaller one is permitted to the people of the bigger. What is the reason? As they made no partition<span class="x" onmousemove="('comment',' And thus indicated that they have no intention of living on their roof.');">³¹</span> they have entirely withdrawn themselves from it, [the principle here being the same] as that enunciated by R'Nahman: If a person fixed a permanent ladder to his roof, he is permitted to use all the roofs'.<span class="x" onmousemove="('comment',' Even according to the SAGES. Since the other residents who fixed no ladders have evidently decided to make no use of their roofs the man who did fix one has all their roofs at his disposal and they are, therefore, deemed to form one single domain with his own roof.');">³²</span> Abaye ruled: If a man built an upper storey on his house,<span class="x" onmousemove="('comment',' By surrounding all his roof with walls.');">³³</span> and constructed in front of it a small door of four handbreadths<span class="x" onmousemove="('comment',' That opened towards the other roofs (Rashi) . Cf. however, Tosaf. a.l.');">³⁴</span> he is thereby permitted to use all the roofs<span class="x" onmousemove="('comment',' Cf. supra n. 2 mut. mut.');">³⁵</span> Raba observed: The small door is sometimes a cause of restrictions<span class="x" onmousemove="('comment',' And the other roofs may not be used even according to R. Meir who holds that ALL THE ROOFS OF A TOWN CONSTITUTE A SINGLE DOMAIN.');">³⁶</span> How is this to be imagined? When he made it to open towards his house garden,<span class="x" onmousemove="('comment',' While the wall facing the roofs remained closed.');">³⁷</span> since it might well be presumed

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