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Summary
Rav Ashi encountered Rav Kahana who was putting schach on a postless exedra. He said to him: Don’t you agree with the rule taught by Rava (16.2) “If there are no posts, it is possul”?
(The sukkah was not wholly without walls. There were two walls at a right angle adjacent to a long, unwalled, postless exedra. Rav Ashi thought Rav Kahana was relying on ‘pi tikrah’ even though Rava did not rely on ‘pi tikrah’ in the case of exedra).
Rav Ashi showed him: [There was a third wall] visible from the outside but not from the inside (The sukkah was made up of a lengthwise wall parallel to the exedra, and another wall perpendicular to it leading up to the exedra. Then there was a tefach extending out behind the second wall, near the exedra, which, if extended, would make up a third wall).
This is in accordance with what we learned (Eiruvin): A lechi which is visible from the outside but not from the inside, permits a mavuy.
And this case is actually the debate of Abayye and Rava (16.2, 16.4) regarding 'posts' (the posts that they argue about is such a case, where the post is 'visible from the outside' only). This podcast has been graciously sponsored by JewishPodcasts.fm. There is much overhead to maintain this service so please help us continue our goal of helping Jewish lecturers become podcasters and support us with a donation: https://thechesedfund.com/jewishpodcasts/donate