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prepared by Rabbi Eliezer Chrysler
Kollel Iyun Hadaf, Jerusalem

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Eruvin 57


(a) Ravina re-establishes the case (of the Migrash being a quarter of the Techum) by a *square* town of two thousand Amos - like Rava - by saying 'Revi'a di'Techumin'.
What does this mean?

(b) Rav Ashi too, learns like Rava. He explains the Revi'is as being Revi'is di'Keranos.
What does that mean?

(c) What problem does Ravina have with Rav Ashi's explanation?

(d) How does Rav Ashi answer Ravina's question (from the "Saviv" of sprinkling the blood)?

(a) The Gemara asks 've'Ha Ika Mursha de'Karnesa'.
What is the final Kashya?

(b) What is the answer?

(a) What exactly, do Chazal mean when they say that a square is a quarter more than a circle?

(b) What problem does that create with what we learnt above, that one adds eight hundred Amos to the diameter of a circle, to form the diagonal of the square that surrounds it?

(c) How does the Gemara resolve this problem?

(a) What does Rebbi Meir learn from the Pasuk in Mas'ei "mi'Kir ha'Ir va'Chutzah"?

(b) What do the Chachamim hold in this regard?

(c) 'va'Chachamim Omrim, Lo Amru Karfaf Ela Bein Sh'tei Ayaros'.
How does Rav Huna, in whose opinion one gives *two* Karfifos between two towns, explain this Mishnah (which appears to bear out the opinion of Chiya bar Rav)?

(d) In fact, the continuation of the Mishnah, is a proof for Rav Huna. How does the Mishnah continue?

Answers to questions



(a) Chiya bar Rav establishes the author of the Seifa of our Mishnah (which gives seventy and two thirds Amos to each of the two towns), as Rebbi Meir. But Rebbi Meir has already taught in the Reisha that every town has a Karfaf? Why does he need to repeat the same Chidush twice?

(b) Our Mishnah states that if there are three villages in a line, and the space between the two outer ones is not more than a hundred and forty one and a third Amos, then all three villages combine.
Why is this a Kashya on Rav Huna?

(c) How does Rav Huna answer this Kashya?

(a) What is the maximum distance that the middle village is permitted to be out of line (according to Rav Huna's interpretation), for it to combine with the other two?

(b) Rava asked Abaye (who made the last point) how he reconciled it with his own statement above (on 55b), where he permitted a town in the shape of a bow, even when the distance between the string and the bow was *more* than two thousand Amos.
What did he answer?

(c) Does the distance between the outer villages make any difference?

(a) How do we reconcile the fact that here we permit the three villages, even if the distance between the outer ones is in excess of four thousand Amos, with Rav Huna, who ruled with regard to the city shaped like a bow, that if there was more than four thousand Amos between the two sides of the bow, they did not combine, but were considered to be two towns?

(b) How did Rava account for the fact that the inhabitants of Akistefun and Ardeshir considered themselves one town, even though the River Diglas, which was wider than a hundred and forty one and a third Amos, divided between them?

(a) What size rope was used for measuring Techumin, and how was the rope held?

(b) What did the measurers do if, in the course of measuring, they encountered ...

  1. ... an acute 'valley'?
  2. ... a steep pile of rubble?
  3. ... a steep hill?
(c) What does the Mishnah mean when it says 'u'Vilevad she'Lo Yetzei Chutz li'Techum' (two explanations), and what is the reason for this?

(d) What does one do if it is not possible to measure the hill from the side?

Answers to questions
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