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Kollel Iyun Hadaf, Jerusalem
(a) In a Mishnah in Keilim, Rebbi Eliezer holds that a bed is subject to Tum'ah, only when it is complete - 'u'Metaheres Chavilah' means that it can also only be Toveled complete, and not section by section.2)
(a) When Rav Ami bar Tivyumi invalidated worn out vessels/clothes that are no longer fit for use from being used as S'chach - he was referring to clothes of less than three Etzba'os (finger-breadths) by three Etzba'os, which is the minimum size garment (that is fit for a poor man to wear).3)
(a) Our Mishnah invalidates a Sukah that is cut out of a haystack - but that is only if there is no hole one Tefach deep that covers an area of seven by seven Tefachim; if there is, then, seeing as the Din Ohel already exists for the entire area of the Sukah, it will be permitted to extend the walls from one Tefach to ten.4) According to the Tana Kama, the wall of a Sukah that begins from the top is only Kasher if it reaches to within at least three Tefachim from the ground (due to 'Levud'), whereas one which begins from the ground is Kasher as long as it reaches a height of ten Tefach, even though it does not reach within three Tefachim of the S'chach - because we apply the principle 'Gud *Aseik* Mechitzasah' (but not 'Gud *Acheis* Mechitzasah').
(a) Rebbi Yossi says that the wall of a Sukah that begins from the S'chach, and stops at ten Tefachim, even if it is more than three Tefachim from the ground - is Kasher, because he maintains that, just as we say 'Gud Aseik Mechitzasah', we also say 'Gud Acheis Mechitzasah'.
(a) Rabah bar bar Chanah quoting Rebbi Yochanan, equates Rebbi Yehudah in the previous question with Rebbi Yossi, who permits a suspended Mechitzah in our Mishnah by Sukah. In fact though ...7)1. ... Rebbi Yehudah does not hold like Rebbi Yossi, because he only applies his lenient ruling by *Eruv*, which is purely mi'de'Rabbanan (since the Torah only forbids carrying from one Reshus to a *different* Reshus - but not from one Reshus ha'Yachid to another), but *not* by *Sukah*, which requires a Mechitzah d'Oraysa.(b) Rebbi Yossi (who does not hold of Mechitzah Teluyah by Dinei Shabbos), was the Rav of Tzipori. They nevertheless permitted a Mechitzah Teluyah there - because that was in the days of Rebbi Yossi's son, Rebbi Yishmael, who disagreed with his father in this point.
(a) The problem in Tzipori was that they forgot to make an Eruv Chatzeros to carry the Sefer-Torah into the Chatzer (or a Shituf Mavo'os to carry it into the Mavoy) - and they now permitted transporting the Sefer-Torah to the Chhatzer (or to house) where it was required, on the grounds that the house where the Torah was, was cordoned off from the other houses by means of the Mechitzah formed by the sheets hanging over the posts (or the Chatzer was cordoned off from the other Chatzeros - and a Chatzer that comprises only one house (or a Mavoy that comprises only one Chatzer), does not require an Eruv). The Mechitzah under discussion, was a Mechitzah Teluyah, which did not reach within three Tefachim from the ground.8)
(a) Rav Chisda permits putting up a mat in between the ceiling and the floor to form the wall of a Sukah. Assuming the mat goes all the way across the Sukah, the smallest size mat that one would need for a Sukah ten Tefachim high would be - four Tefachim and a bit (enabling us to apply 'Levud' both at the top and at the bottom).9) The Chidush of the Beraisa, which permits placing a post of four Tefachim and a Mashehu within three Tefachim of an existing wall (and adjacent to it), to form the second wall of the Sukah - is that the minimum size of a Sukah is seven Tefachim (by seven Tefachim).