Commentary for Eruvin 155:15

אמר רב סולם זקוף ממעט גמרא ולא ידענא מ"ט

to render it permissible for use<span class="x" onmousemove="('comment',' Sc. to allow free movement of objects between the courtyards. As the ladder, the wall, and the part of the courtyard floor between the latter and the foot of the former represent respectively the hypotenuse and the two sides of an isosceles right-angled triangle, and since the wall is ten handbreadths high and the distance between the foot of the ladder and the wall is also (cf. prev. n.) ten handbreadths, the length, or height of the ladder must be (10 + 10 X 2/5 approx. = 10 + 4 =) 14 handbreadths approx. (cf. Tosaf. a.l.) .');">³⁵</span> R'Joseph ruled: Even [a ladder] of thirteen handbreadths<span class="x" onmousemove="('comment',' A handbreadth less than the length required by Rab Judah.');">³⁶</span> and a fraction [is sufficient].<span class="x" onmousemove="('comment',' In his opinion it is either not necessary (cf. Supra n. 5) to remove the foot of the ladder as much as ten handbreadths from the wall, or it suffices if its top reaches only to within one handbreadth from the top of the wall (cf. R. Han.) .');">³⁷</span>

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