Category: Eruvin

Learn גמרא דף ה: “אמר רב חנן בר רבא (two dots on bottom of the Amud) until אמר רב נחמן בר יצחק ((nine lines from top of the Amud)
Clarify what is defined as ‘ראשו’

Learn “תוס’ ו. “מצידו

Questions:
Are all doorways in corners not considered פתחים?
Learn “תוס’ ו. “דפתחא

Why does רב הונא say that even a gap in the sidewall of a Mavui of only four tefachim is considered a פירצה?
Learn “תוס’ ו. “אחד

Conclusion of Sugya שיעור לחי ועומד מרובה:

Please write a synopsis of the Sugya and how the  ח’ הג”ר משה הלוי על רמב”ם ה’ שבת פרק י”ז הלכה כב answered the following questions on the Rambam. 

See רמב”ם ה’ שבת פרק י”ז הלכה כב the first line and then skip to “לחי שהיה רחב הרבה”

https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=76

Major Questions on the Rambam:

1. How could the Rambam rule that a לחי is Kosher as long as it is not more than half the width of the Mavui. Our Gemara clearly says that if the לחי is four Amos wide it is disqualified? 
2. How could the Rambam say when the lechi is the same size as the open space it is considered a Lechi when our gemara said when they are equal size the Mavui one is not permitted to carry in the Mavui? 
3. See רמב”ם ה’ שבת פרק ט”ז הלכה ט”ז who rules פרוץ כעומד מותר (equal closure to open space is considered a mechitza) Why does the Rambam say that when the lechi is the same size as the open space it is considered a Lechi and not valid through the concept of פרוץ כעומד מותר?

Conclusion of Sugya שיעור לחי ועומד מרובה:
Very quickly review the גמרא דף ה: “רב אשי אמר (seven lines from bottom of the Amud) until the two dots.

Review רמב”ם ה’ שבת פרק י”ז הלכה כב the first line and then skip to “לחי שהיה רחב הרבה”
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=76

Major Questions on the Rambam:
How could the Rambam rule that a לחי is Kosher as long as it is not more than half the width of the Mavui. Our Gemara clearly says that if the לחי is four Amos wide it is disqualified?
How could the Rambam say when the lechi is the same size as the open space it is considered a Lechi when our gemara said when they are equal size the Mavui one is not permitted to carry in the Mavui?
See רמב”ם ה’ שבת פרק ט”ז הלכה ט”ז who rules פרוץ כעומד מותר (equal closure to open space is considered a mechitza) Why does the Rambam say that when the lechi is the same size as the open space it is considered a Lechi and not valid through the concept of פרוץ כעומד מותר?
Learn מגיד משנה “לחי הבולט who explains how the Rambam learns the conclusion of our Gemara. But remains with a question on the Rambam
Learn ח’ גרי”ז בכורות י”ז עמוד ב

Learn ח’ הג”ר משה הלוי על רמב”ם ה’ שבת פרק י”ז הלכה כב (see below. One more page added below today for an explanation of the Rambam

Quickly review the גמרא דף ה: “רב אשי אמר (seven lines from bottom of the Amud) until the two dots.

Question:
When the closure is equal to the open space we should still permit carrying in the Mavui as we rule פרוץ כעומד מותר?

Learn תוס’ ” וספק (first two lines until וא”ת אמאי)

Learn רמב”ם ה’ שבת פרק י”ז הלכה כב the first line and then skip to “לחי שהיה רחב ד “
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=76

Major Question:
The Rambam rules a לחי is Kosher as long as it is not more than half the width of the Mavui. Our Gemara clearly says that if the לחי is four Amos wide it is disqualified?

Learn מגיד משנה “לחי הבולט who explains how the Ramabam learns the conclusion of our Gemara. But remains with a question on the Rambam
Learn ח’ גרי”ז בכורות י”ז עמוד ב

Is there a difference in the concept of עומד מרובה to פרוץ כעומד מותר?
Learn ח’ הגר” משה הלוי על רמב”ם ה’ שבת פרק י”ז הלכה כב

Learn the גמרא דף ה: “רב אשי אמר (seven lines from bottom of the Amud) until the two dots.

Question:

When the closure is equal to the open space we should still permit carrying in the Mavui as we rule פרוץ כעומד מותר?

Learn תוס’ ” וספק (first two lines until וא”ת אמאי)

Learn רי”ף

https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=327

Learn רבינו יהונתן “דהוה ליה פרוץ

Learn רמב”ם ה’ שבת פרק י”ז הלכה כב the first line and then skip to “לחי שהיה רחב ד “

https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=76

Learn רמב”ם ה’ שבת פרק י”ז הלכה כב the first line and then skip to “לחי שהיה רחב ד “
Major Question:
The Rambam rules a לחי is Kosher as long as it is not more than half the width of the Mavui. Our Gemara clearly says that if the לחי is four Amos wide it is disqualified?
Learn מגיד משנה “לחי הבולט who explains how the Ramabam learns the conclusion of our Gemara. But remains with a question on the Rambam
Learn ח’ גרי”ז בכורות י”ז עמוד ב

Is there a difference in the concept of עומד מרובה to פרוץ כעומד מותר?
Learn ח’ הגר” משה הלוי על רמב”ם ה’ שבת פרק י”ז הלכה כב

Quickly review the גמרא דף ה: “אמר רב הונא (eight lines from top of the Amud) until “רב אשי אמר (seven lines from bottom of the Amud)

Review the second half of “תוס’ “קל וחומר starting from “ואמחיצה רביעית”

Question:
Does a פס ד need to be recognizable that it was placed there to be a tikun for the Chatzer or Mavui?
Learn “תוס’ “אינו
Clarify the difference in the operation of Tikunei Chatzer and Mavui according to Tosfos.

Major Question:
Tosfos says that עמוד מרובה is accepted on the three primary sides of a Mavui. This is a contradiction to Tosfos above who said we can only learn עמוד מרובה works on the fourth side?
Learn “תוס’ רבינו פרץ “אבל במבוי

Continue learning the גמרא דף ה: “רב אשי אמר (seven lines from bottom of the Amud) until the two dots.
Learn תוס’ ” וספק (first two lines until וא”ת אמאי)

Learn רמב”ם ה’ שבת פרק י”ז הלכה כב the first line and then skip to “לחי שהיה רחב ד “
Major Question:
The Rambam rules a לחי is Kosher as long as it is not more than half the width of the Mavui. Our Gemara clearly says that if the לחי is four Amos wide it is disqualified?
Learn מגיד משנה “לחי הבולט who explains how the Ramabam learns the conclusion of our Gemara. But remains with a question on the Rambam
Learn ח’ גרי”ז בכורות י”ז עמוד ב

Quickly review the גמרא דף ה: “אמר רב הונא (eight lines from top of the Amud) until “רב אשי אמר (seven lines from bottom of the Amud)

Review the second half of “תוס’ “קל וחומר starting from “ואמחיצה רביעית”
Major Question:
The concept of עמוד מרובה is a halacha l’moshe misinai in the laws of mechitza. Why should we need a קל וחומר from חצר to teach us it is considered a valid wall for the fourth side of a Mavui?
Why is עמוד מרובה not accepted for the other three sides of a Mavui especially when we see it works by a חצר?
We discussed the explanation of the Brisker Rav (גרי”ז בכורות דף יז עמוד ב “והנה בעירובין) that Rabanan made a tikun on the fourth side of a Mavui that it needs to be considered closed. Therefore the קל וחומר is needed to teach us that עמוד מרובה besides being considered a mechitza is also viewed as closing the fourth side.

Tosfos says although עמוד מרובה is acceptable for a Chatzer on all four sides we can only learn from a קל וחומר to Mavui that it should be valid for the fourth side. The Brisker Rav said that the קל וחומר is only needed to teach us that עמוד מרובה is an acceptable Tikun of the fourth side and we view it as closing the fourth side. How could Tosfos entertain the idea that we could learn that עמוד מרובה should work for the other three sides?
Learn מהרש”א
https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=263

In conclusion, is עמוד מרובה accepted for the other three sides of a Mavui?
Learn מהרש”א מהדורא בתרא
https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=296
Learn שפת אמת על תוס’ “ק”ו
https://hebrewbooks.org/pdfpager.aspx?req=14521&st=&pgnum=187

Question:
Does a פס ד need to be recognizable that it was placed there to be a tikun for the Chatzer or Mavui?
Learn “תוס’ “אינו
Clarify the Tikunim of chatzer and mavui according to Tosfos.
Question:
Tosfos says that עמוד מרובה is accepted on the other three sides of a Mavui. This is contradiction to Tosfos above who said we can not learn that from the ק”ו?
Learn “תוס’ רבינו פרץ “אבל במבוי

Review the גמרא דף ה: “אמר רב הונא (eight lines from top of the Amud) until “רב אשי אמר (seven lines from bottom of the Amud)

Review “תוס’ “קל וחומר
Major Question:
The concept of עמוד מרובה is a halacha l’moshe misinai in the laws of mechitza. Why should we need a קל וחומר from חצר to teach us it is considered a valid wall for the fourth side of a Mavui?
Why is עמוד מרובה not accepted for the other three sides of a Mavui especially when we see it works by a חצר?
Yesterday we discussed the explanation of the Brisker Rav (גרי”ז בכורות דף יז עמוד ב “והנה בעירובין) that Rabanan made a tikun on the fourth side of a Mavui that it needs to be considered closed. Therefore the קל וחומר is needed to teach us that עמוד מרובה besides being considered a mechitza is also viewed as closing the fourth side.

Tosfos says although עמוד מרובה is acceptable for a Chatzer on all four sides we can only learn from a קל וחומר to Mavui that it should be valid for the fourth side. Why?

In conclusion, is עמוד מרובה accepted for the other three sides of a Mavui?
Learn מהרש”א
https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=263

Learn מהרש”א מהדורא בתרא
https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=296

Learn שפת אמת על תוס’ “ק”ו
https://hebrewbooks.org/pdfpager.aspx?req=14521&st=&pgnum=187

Question:
Does a פס ד need to be recognizable that it was placed there to be a tikun for the Chatzer or Mavui?
Learn “תוס’ “אינו
Learn תוס’ רבינו פרץ “אבל במבוי

Learn the גמרא דף ה: “אמר רב הונא (eight lines from top of the Amud) until “רב אשי אמר (seven lines from bottom of the Amud)

Learn “תוס’ “קל וחומר
Major Question:
The concept of עמוד מרובה is a halacha l’moshe misinai in the laws of mechitza. Why should we need a קל וחומר from חצר to teach us it is considered a valid wall for the fourth side of a Mavui?
Why is עמוד מרובה not accepted for the other three sides of a Mavui especially when we see it works by a חצר?
Learn גריז בכורות דף יז עמוד ב “והנה בעירובין
and חזון איש ה’ עירובין ס’ ס”ה ס”ק א-ב for an explanation.

Question:
Does a פס ד need to be recognizable that it was placed there to be a tikun for the Chatzer or Mavui?
Learn “תוס’ “אינו

Review the גמרא דף ה. “גופא אמר רמי בר חמא (two dots – two lines from bottom of the Amud) until דף ה: “אמר רב הונא (eight lines from top of the Amud)
Learn תוס’ “פחות

Questions:
Rashi says if one built a wall of four Amos intentionally as a לחי it is valid. Why is the new לחי which is being added to the wall of four Amos disqualified?
Learn מלא הרועים

Why is adding a לחי to an existing wall of four Amos invalidated according to the opinion of לחי משום מחיצה? Wouldn’t the extra closure be better?
Learn תוס’ “ארבע

Continue learning the גמרא דף ה: “אמר רב הונא (eight lines from top of the Amud) until “רב אשי אמר (seven lines from bottom of the Amud)

Review “תוס’ דף ה “דפתח ליה בקרן זוית

What is the point of disagreement between Rashi and Tosfos?

Learn מהרש”א

https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=263

and רש”ש

https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=298&hilite=

Learn the גמרא דף ה. “גופא אמר רמי בר חמא (two dots – two lines from bottom of the Amud) until דף ה: “אמר רב הונא (eight lines from top of the Amud)

Questions:

Rashi says if one built a wall of four Amos intentionally as a לחי it is valid. Why cant adding a לחי to an existing wall of four Amos be valid?

Learn מלא הרועים

https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=315

Why is adding a לחי to an existing wall of four Amos invalidated according to the opinion of לחי משום מחיצה? Wouldn’t the extra closure be better?

Learn תוס’ “ארבע

Learn the גמרא דף ה. “אמר אביי until “אמר אביי” (nine lines from the bottom of the Amud)
Learn “תוס’ “ואי
What is the point of disagreement between Rashi and Tosfos?
Learn מהרש”א

Learn “תוס’ “דפתח ליה בקרן זוית
What is the point of disagreement between Rashi and Tosfos?
Learn מהרש”א https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=263

Learn the גמרא דף ה. “אמר אביי (nine lines from the bottom of the Amud) until the two dots (two lines from bottom of the Amud)

Very quickly review the גמרא דף ה. “היה פחות מעשרה טפחים until “אמר אביי”
Focus on the reason why a lechi or a korah will not allow one to carry in a mavui where there is no side wall of 4 tefachim at the entrance of the mavui.
Review רש”י מתיר פירצה “מתיר who gives an explanation.

Learn תוס’ “סוף
What is the point of disagreement between Rashi and Tosfos?

Learn the גמרא דף ה. “אמר אביי until “אמר אביי” (nine lines from the bottom of the Amud)
Learn תוס’ “ואי
What is the point of disagreement between Rashi and Tosfos?

Learn תוס’ “דפתח ליה בקרן זוית
What is the point of disagreement between Rashi and Tosfos?

Very quickly review the גמרא דף ה. “היה פחות מעשרה טפחים until “אמר אביי”
Questions:
Is the case of the gemara that the קורה is placed within 10 tefachim of the ground or the walls of the entire מבוי are less than 10 tefachim?
Bring a proof from Rashi
Learn ריטב”א דף ה. “רב יוסף
https://hebrewbooks.org/pdfpager.aspx?req=37287&st=&pgnum=7
Bring a proof from Ritva
Learn רשב”א עבודת הקודש שער א ס’ ג “הניח את הקורה למטה מעשרה
https://hebrewbooks.org/pdfpager.aspx?req=49498&st=&pgnum=5
Learn גאון יעקב דף ה. “עד כאן לא קאמרי who discusses this point
https://hebrewbooks.org/pdfpager.aspx?req=14053&st=&pgnum=24

How wide does the excavation need to be? 4 tefachim? 4 Amos? the width of the mavui?
Learn רא”ש ס’ ד “אם היה גבוה פחות מעשרה
https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=213
See רי”ף
https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=326
Learn גאון יעקב דף ה. “עד כאן לא פליגי who discusses this point
https://hebrewbooks.org/pdfpager.aspx?req=14053&st=&pgnum=21

Review the גמרא דף ה. “היה פחות מעשרה טפחים until “אמר אביי”
Questions:
Why does רב יוסף say when the קורה is higher than 20 Amos you only need a build up of ground of a tefach underneath, but if the קורה is below 10 tefachim one needs to excavate an amount of four tefachim inside the mavui?
See “רש”י “רב יוסף
According to Rashi is the קורה acting as a מחיצה?

Is the case of the gemara that the קורה is placed within 10 tefachim of the ground or the walls of the entire מבוי are less than 10 tefachim?
Bring a proof from Rashi
Learn ריטב”א דף ה. “רב יוסף
https://hebrewbooks.org/pdfpager.aspx?req=37287&st=&pgnum=7
Bring a proof from Ritva
Learn רשב”א עבודת הקודש שער א ס’ ג “הניח את הקורה למטה מעשרה
https://hebrewbooks.org/pdfpager.aspx?req=49498&st=&pgnum=5
Learn גאון יעקב דף ה. “עד כאן לא קאמרי who discusses this point
https://hebrewbooks.org/pdfpager.aspx?req=14053&st=&pgnum=24

How wide does the excavation need to be? 4 tefachim? 4 Amos? the width of the mavui?
Learn רא”ש ס’ ד “אם היה גבוה פחות מעשרה
https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=213
See רי”ף
https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=326
Learn גאון יעקב דף ה. “עד כאן לא פליגי who discusses this point
https://hebrewbooks.org/pdfpager.aspx?req=14053&st=&pgnum=21

Questions on maximum height of קורה:
If קורה משום מחיצה why is there a maximum limit of 20 Amos height?
See רש”י דף ה. “ומאן דאמר ארבעה
See רבינו יהונתן דף ב. “ור”י פליג
https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=326

How does an אמלתרא help to allow the קורה to be placed higher than 20 Amos?
See קרן אורה דף ה. “ויש לדקדק
https://hebrewbooks.org/pdfpager.aspx?req=14350&st=&pgnum=59

Learn the גמרא דף ה. “היה פחות מעשרה טפחים until “אמר אביי”
Questions:
Why does רב יוסף say when the קורה is higher than 20 Amos only need a build up of ground of a tefach underneath, but if the קורה is to low one needs to excavate an amount of four tefachim inside the mavui?
See רש”י “רב יוסף
Is the case of the gemara that the קורה is to low or the walls of the מבוי are less than 10 tefachim?
Bring a proof from Rashi

Learn תוס’ “סוף

Conclusion Sugya – קורה גבוהה מכ’ אמה
Very quickly review the גמרא דף ה. “ואבעית אימא (fifth line from top of Amud) until the two dots on דף ה

Clarify the third and fourth explanation of the Gemara

Learn רי”ף who explains the reduction of the height of the קורה different than Rashi
Question:
According to the רי”ף where is the height reduction taking place? (This is a matter of dispute)
Learn רשב”א who asks multiple questions on the רי”ף?
Learn רבינו יהונתן on the side of the רי”ף
Learn רא”ש ס’ ד
See קרבן נתנאל אות ז
See רמב”ם ה’ שבת פרק יז הלכה טז and מגיד משנה
See עבודת הקודש לרשב”א שער ראשון ס’ ג אות ז

See פ’ חסדי דוד on side of the תוספתא עירובן א,א

Questions:
If קורה משום מחיצה why is there a maximum limit of 20 Amos height?
See רש”י דף ה. “ומאן דאמר ארבעה
See רבינו יהונתן דף ב. “ור”י פליג
How does an אמלתרא help to allow the קורה to be placed higher than 20 Amos?

Learn the גמרא דף ה. “היה פחות מעשרה טפחים until “אמר אביי”
Question:
Why is the amount of excavation different than the build up of ground needed when the קורה is higher than 20 Amos?