Reference for Eruvin 5:23

מאי שנא סוכה דכשירה דאמרינן קלוש במבוי נמי לימא קלוש

but, then, [why should it not] be said in respect of a sukkah also, [Regard the roof as] thinned?<span class="x" onmousemove="('comment',' And only that portion remained that lay within the twenty cubits. , particip. pass. of 'to weaken', 'to thin out'.');">⁵⁰</span> - If you [assume the roof to be] thinned, the sunshine in the sukkah [would have to be assumed to be] more than the shade.<span class="x" onmousemove="('comment',' And this would render the sukkah invalid. The roof of a proper Sukkah must be thick enough to enable the shadows in the interior to predominate over the sunshine.');">⁵¹</span> But here also,<span class="x" onmousemove="('comment',' In the case of a cross-beam over an entrance.');">⁵²</span>

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