Quoting%20commentary for Eruvin 180:10

אמר רב יהודה כשתמצא לומר לדברי רבי מאיר גגין רשות לעצמן חצירות רשות לעצמן

B'Ulla replied: The prohibition is due to a preventive measure against the possibility of a reduction in the area of the roof.<span class="x" onmousemove="('comment',' As well as that of the house under it to less than two beth se'ah, when it would assume the status of a private domain from which into a karpaf the movement of objects is forbidden.');">²²</span> But if so, it should also be forbidden to move an object<span class="x" onmousemove="('comment',' Even within four cubits.');">²³</span> from karpaf to karpaf<span class="x" onmousemove="('comment',' Each of which was bigger than two beth se'ah.');">²⁴</span> since the area of one of them might happen to be reduced<span class="x" onmousemove="('comment',' And thus assume the status of a private domain.');">²⁵</span> and people would still be moving objects from one to the other? - If a reduction were to occur there<span class="x" onmousemove="('comment',' In the area of a karpaf.');">²⁶</span> it would be noticeable<span class="x" onmousemove="('comment',' One could not fail to observe a reduction in all enclosed space.');">²⁷</span> but if a reduction should take place here<span class="x" onmousemove="('comment',' In a roof which is all unenclosed space since it had no walls around it.');">²⁸</span> it might not be noticed at all.<span class="x" onmousemove="('comment',' It is very difficult to recognize a small difference in an open area.');">²⁹</span> Rab Judah stated: A careful study would show that<span class="x" onmousemove="('comment',' Lit., 'when you will find to say'.');">³⁰</span> according to the view of R'Meir roofs are regarded as a Separate domain, courtyards as a separate domain

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