Commentary for Eruvin 155:3

ואמר רב נחמן אמר רבה בר אבוה כותל תשעה עשר צריך זיז אחד להתירו

of its the latter is thereby merely extended.<span class="x" onmousemove="('comment',' But as the ladder now forms no connection between it and the ground it is, on account of the distance of the latter from it, no valid reduction.');">⁷</span> R'Nahman further stated in the name of Rabbah B'Abbuha: A wall<span class="x" onmousemove="('comment',' Between two courtyards.');">⁸</span> that was nineteen handbreadths high requires only one projection<span class="x" onmousemove="('comment',' In the middle of its height on which the top of a ladder may be supported.');">⁹</span>

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