Reference for Eruvin 18:8
האי מאי בשלמא ר' יוחנן לא סבר לה משום הכי לא תני לה אלא ר' חייא אי איתא דלא סבר לה למה ליה למיתנא
A wall of which one side recedes more than the other, whether [the recess can be] seen from without and appears even from within or whether it can be seen from within and appears even from without, may be regarded as [being provided with] a side-post.<span class="x" onmousemove="('comment',' That side-post being provided by the thicker projection of the wall that is formed by the receding of the remainder of the wall between it and the back of the alley or by the thinner projection formed by the receding of the wall at that point.');"><sup>18</sup></span> This is conclusive. Did not R'Johanan, however, hear this?<span class="x" onmousemove="('comment',' The Baraitha just cited in the name of R. Hiyya. How then could he maintain supra that such a post cannot be regarded as a valid side-post?');"><sup>19</sup></span>
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