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Eruvin 87
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ERUVIN 87 - has been dedicated by Rabbi Dr. Eli Turkel of Ra'anana,
Israel, to the memory of his father, Yisrael Shimon ben Shlomo ha'Levi
Turkel.
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1) APPLYING "PI TIKRAH"
QUESTION: The Gemara discusses a horizontal plank that is at the side of a
building. If it has the appropriate length and width, we may simply view
the sides of the plank as bending down, forming Mechitzos of ten Tefachim
around an area of four by four Tefachim.
Why does such a plank not create an enclosed area beneath it through the
principle of Pi Tikrah Yored v'Sosem? Let us simply view the thickness of
the plank as extending downward to form Mechitzos and make an enclosure
around a Reshus ha'Yachid, even if it is not wide enough to bend down ten
Tefachim of each side?
ANSWERS:
(a) TOSFOS (86b, DH Gezuztra) answers that here, we may be discussing a
situation where the plank slopes down at its sides. In such a case, Pi
Tikrah does not apply (Eruvin 25b, "Ki Urzila").
(b) Tosfos suggests another possibility. Perhaps the principle of Pi
Tikrah Yored v'Sosem applies only when the exposed edge of the board's
thickness is a flat, smooth surface. Here, though, the side of the plank
is perhaps jagged and full of dents and nicks, and thus Pi Tikrah does not
work.
(c) Tosfos cites RASHI (Sukah 18b) who says that Pi Tikrah applies only
when the beam is at least one Tefach thick. Here, though, the plank is
less than a Tefach thick.
(d) The RITVA and other Rishonim cite an opinion that Pi Tikrah is not
applied to a board hanging more than 20 Amos above the ground. Perhaps the
plank of our Sugya is higher up than that.
87b
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