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Abayye: If one puts schach atop an exedra, it is kosher even though there are no posts because ‘pi tikrah yoreid v’soseim’.

Rava: It is possul.

Summary

Challenge: We learned in the Mishna (14.4): The same rule applies to a courtyard surrounded by cloisters, the center may be covered with schach [only] if it would be less than 4 amos away from the wall.

This is a clear contradiction to Abayye, who says in our case that pi tikrah yoreid v’soseim”!

Rava explained it according to Abayye: In the mishna’s case, the schach covers up the thickness of the ceiling (pi tikrah works based on the premise that the thickness of the ceiling can be seen as the beginning of a wall. But here the thickness is covered by schach, so there is no wall).

16.2: If one puts schach atop an exedra [a partially roofed courtyard as in 14.4] where there are posts within 3 tefachim of each other, it is kosher.

If there are no posts; Abayye: It is kosher. Rava: It is possul.

This is how the sugya was taught in Sura (the yeshiva of Rav).

In Pumbedisa (the yeshiva of Shmuel) it was taught differently:

If one puts schach atop an exedra that has no posts, it is possul (nobody holds ‘pi tikrah’).

If it has posts within 3 tefachim of each other:

Abayye: It is kosher.

Rava: It is possul.

Abayye: It is kosher, because we follow the principle of lavud.

Rava: It is possul , because we don’t follow lavud in this case (because the wall that would be created by lavud, can only serve the portico, not the open courtyard [if it would be a solid wall it wouldn’t matter]).

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