Reference for Eruvin 181:1
קרפיפות רשות לעצמן לדברי חכמים גגין וחצירות רשות אחת קרפיפות רשות אחת הן לדברי רבי שמעון כולן רשות אחת הן
and karpafs as a separate domain;<span class="x" onmousemove="('comment',' Supra 89a q.v., notes.');"><sup>1</sup></span> that, according to the view of the Sages,<span class="x" onmousemove="('comment',' Who, unlike R. Meir, did not make provision against the possibility of using a mound in a public domain.');"><sup>2</sup></span> roofs and courtyards form a single domain<span class="x" onmousemove="('comment',' It being permissible to move objects from one courtyard into another if both belonged to more than one person, or from a private roof (since it is only infrequently used) into such a courtyard. Between private roofs this is forbidden, since in the view of' the Rabbis, the domains on the roofs are as divided as the domains of the houses below,');"><sup>3</sup></span>