REVIEW QUESTIONS ON GEMARA AND RASHI
prepared by Rabbi Eliezer Chrysler
Kollel Iyun Hadaf, Jerusalem
Previous dafEruvin 76
ERUVIN 76 - dedicated by Dick and Beverly Horowitz and sons Sam and Mike,
in memory of Beverly's mother, Miriam Kurtz.
(a) Rachbah asked his Talmidim what the Din would be if there were two
courtyards, one at either end of the two adjoining houses, each with a
house at the far end, and the residents of each courtyard wished to make
an independent Eruv to carry in their courtyard. To do this, they wished
to place their respective Eruvin in the other house (that did *not* adjoin
their courtyard, treating the adjoining house that *did*, as a Beis-Sha'ar.
***** Hadran Alach, 'ha'Dar'! *****
What did they answer?
(b) What does Rava say about two individual people who asked someone to
place two Eruvin for them, which he did, one when it was still day, the
other during Bein Hashemashos, if the first one was eaten during Bein
Hashemashos, and the second one after nightfall?
(c) What is Rava's big Chidush, and what problem does it present the
Talmidim of Rachbah?
(d) What is the basic difference between the two cases?
***** Perek Chalon *****
(a) Where must a window in a wall between two courtyards be placed to
enable them to make a joint Eruv, and what must its minimum dimensions be?
(b) Why is a window that is higher than ten Tefachim not considered a
Pesach in this regard?
(a) Is the Din of four by four Tefachim in our Mishnah connected to the
Din of Levud?
(b) If it had been, who would have to be the author of our Mishnah?
(c) Having informed us that the window must be within ten Tefachim of the
ground, why does the Mishnah then see fit to add that if it above ten
Tefachim, it is invalid?
(d) Having already taught us that a window which is mostly above ten
Tefachim is still valid, why does the Beraisa need to then add that if it
is mostly within ten Tefachim, it is also valid?
(a) Rebbi Yochanan states that a circular window must have a circumference
of twenty-four Tefachim.
Answers to questions
Why is that?
(b) And why does he say that at least two Tefachim and a Mashehu must be
within ten Tefachim from the ground?
(a) How much more is ...
(b) What then ought the circumference of Rebbi Yochanan's circular window
- ... the circumference of a circle than its diameter?
- ... the area of a square than the circumference of the circle that contains it?
- ... the diagonal of a square more than one of its sides?
(c) So why does Rebbi Yochanan require twenty-four Tefachim?
(a) The ruling of our Mishnah (that a window in a wall above the height of
ten Tefachim is invalid as regards Eruv) does not apply to a wall in
between two houses, says Rav Nachman.
(b) How does Rav Nachman explain the Beraisa, which writes that whether a
window is between two courtyards, two houses, two attics, two roofs or two
rooms, it needs to be four by four Tefachim and within ten Tefachim?
(c) Who must be the author of this Beraisa (which requires an Eruv for two
(a) Rav Aba asked Rav Nachman whether a skylight (that leads to the attic
belonging to a second person) in the middle of the ceiling, requires a
fixed ladder or not? What is the Sha'aleh, and why might it need one?
(b) Rav Nachman replied that it does not in fact, require a *fixed*
Does it require a ladder at all?
(a) Is it possible for two houses whose garden or courtyard is divided by
a wall of ten Tefachim to make a combined Eruv?
(b) Why does the Mishnah add that the wall is four Tefachim wide? Is that
because otherwise, it would not be considered a wall to divide between two
(c) May one use the wall to transfer food etc. from one courtyard to the
(a) How wide would a breach in the wall need to be in order to retain the
right to make an independent Eruv, and why is this?
(b) What will be the Din if, in the case when the breach is more than ten
Amos, the residents of each Chatzer make an independent Eruv? Are their
respective Eruvin valid?
(a) According to Rav, if the wall is less than four Tefachim wide, the top
may not be used by either Chatzer.
Answers to questions
(b) What does Rebbi Yochanan hold?