Reference for Eruvin 183:13
כיצד גפנים בגדולה אסור לזרוע את הקטנה ואם זרע זרעין אסורין
this<span class="x" onmousemove="('comment',' The repetition of the same principle.');"><sup>55</sup></span> was intended to teach us that a ROOF is subject to the same limitations as a COURTYARD: As in a courtyard the walls are distinguishable<span class="x" onmousemove="('comment',' Since it has proper walls.');"><sup>56</sup></span> SO must the walls be distinguishable in the case of a roof also;<span class="x" onmousemove="('comment',' I.e the roof must not project beyond the walls. If it does the rule of upward extension cannot apply.');"><sup>57</sup></span> and according to Samuel's view<span class="x" onmousemove="('comment',' That the rule of upward extension is applicable even where the walls are indistinguishable when viewed from the roof.');"><sup>58</sup></span> a no ROOF was meant to be compared to a COURTYARD: As a courtyard is a place upon which many people tread so must a roof<span class="x" onmousemove="('comment',' If its use is to be forbidden.');"><sup>59</sup></span> be one on which many people tread.<span class="x" onmousemove="('comment',' If many people do not tread upon it, the rule of upward extension is applied even where the walls are indistinguishable from above.');"><sup>60</sup></span> Rabbah and R'Zera and Rabbah son of R'Hanan<span class="x" onmousemove="('comment',' MS.M., 'Abin'.');"><sup>61</sup></span> were sitting at their studies, Abaye sitting beside them, and in the course of their session they argued as follows: From our Mishnah it may be inferred that the occupiers of the larger one influence the rights of those of the lesser but those of the latter do not influence those of the former. If, for instance,<span class="x" onmousemove="('comment',' Lit., 'how?'');"><sup>62</sup></span> vines were planted in the larger one, it is forbidden to sow in the lesse one,<span class="x" onmousemove="('comment',' Because the latter is regarded as a part of the former in which it is forbidden to sow vines and corn together (v. Glos. s.v. kil'ayim) .');"><sup>63</sup></span> and if it was sown, the seeds are forbidden; and