Shabbos Chart #6

MATERIALS OTHER THAN WOOL AND LINEN
WITH REGARD TO TUM'AS SHERATZIM

		(A) ABAYE	(B) RAVA	(C) RAV PAPA AND RAV NACHMAN BAR YITZCHAK
1)	REBBI SHIMON BEN ELAZAR	They cannot become Tamei	They can become Tamei if they are 3 X 3 Tefachim	--- (3)
2)	TANA D'VEI REBBI YISHMA'EL (THE FIRST)	They cannot become Tamei	In doubt(2)	They can become Tamei if they are 3 X 3 Etzba'os (4)
3)	TANA D'VEI REBBI YISHMA'EL (THE SECOND)	They can become Tamei if they are 3 X 3 Etzba'os(1)	They can become Tamei if they are 3 X 3 Tefachim	They can become Tamei if they are 3 X 3 Etzba'os (5)

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FOOTNOTES:
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(1) Tosfos writes (26b, DH Rebbi Shimon Ben Elazar) that according to Abaye we find no one who differentiates between three by three Tefachim and three by three Etzba'os.
(2) At first (26b) Rava said that they do not become Tamei, but later (27a) the Gemara is in doubt whether Rava retracted his original statement and said that they can become Tamei if they are 3 X 3 Tefachim, or whether he maintained his original opinion that they cannot become Tamei at all.
(3) This is not clarified in the Gemara.
(4) According to Rav Papa, Tana d'Vei Rebbi Yishma'el is only teaching that other types of garments are not included in the prohibition of Kela'im (Shatnez). According to Rav Nachman Bar Yitzchak, Tana d'Vei Rebbi Yishma'el is only teaching that other types of garments are exempt from Tzitzis. See following footnote.
(5) This is Rashi's understanding of the Sugya. The Ramban, however, argues with Rashi and explains that these garments do not become Tamei according to Rav Papa unless they are 3 X 3 Tefachim (this is also the way the P'nei Yehoshua explains the Sugya) -- see Insights.