Category: Morning Chabura

Conclusion of סוגיא צורת הפתח – כיפה  – arch

Question: 

Why is an arched door frame which starts to arch from the bottom of the side posts not obligated in mezuzah?

Is it only when lacking width of 4 tefachim with a minimum height of 3 tefachim or is it because a door frame needs to have straight side posts and a flat lintel?

Is a doorframe which is wider than four tefachim that begins to arch from bottom of the side posts considered a צורת הפתח ?

See Rashi – Beis Yosef

https://hebrewbooks.org/pdfpager.aspx?req=14272&st=&pgnum=469&hilite=

See רש”י דף יא עמוד ב on our sugya 

Learn ח’ ר”ן “כיפה

Learn ריטב”א “ר”מ מחייב 

Learn רמב”ם ה’ מזוזה פרק ו הלכה ד

https://hebrewbooks.org/pdfpager.aspx?req=58957&st=&pgnum=244&hilite=

Why does the Rambam omit the detail of minimum width of four tefachim for the doorway?

Why is a doorframe which side posts begin to arch before ten tefachim from the ground exempt from mezuzah? 

How does the Shulchan Aruch conclude?

Learn שולחן ארוך יו”ד ס’ רפ”ז 

https://hebrewbooks.org/pdfpager.aspx?req=9732&st=&pgnum=478

Learn שולחן ארוך או”ח ס’ שס”ב סע’ יב and משנה ברורה

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=55

Learn חזון איש או”ח ס’ ע”א ס”ק ג

https://hebrewbooks.org/pdfpager.aspx?req=14336&st=&pgnum=224

Sagging Wires

Is a צורת הפתח which top wire sags (bows) kosher? 

Learn שער הציון או”ח ס’ שס”ב אות נו which quotes the opinion of משכנות יעקב ס’ קכ”ג 

Learn

חזון איש או”ח ס’ ע”א ס”ק י

https://hebrewbooks.org/pdfpager.aspx?req=14336&st=&pgnum=225

And אמרי יושר חלק ה’ ס’ קל”א 

Obstruction between Lechi & Top String

Learn ט”ז או”ח ס’ שס”ב ס”ק י”ט

https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=230

See משנה ברורה ס’ שס”ג ס”ק קיב

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=64

And ערוך השולחן או”ח ס’ שס”ב סע’ מו

https://hebrewbooks.org/pdfpager.aspx?req=9101&st=&pgnum=428

Review גמרא דף יא: “אשכחיה רב ששת (seven lines before the Mishna) until the Mishna.

See רש”י “חייבת which brings two גירסאות  in the gemara. Rashi says this gemara is proof that the side posts do not need to touch the top post.  

What is the proof?

Is the proof only from the opinion of the Rabanan or also from Rebbe Meir?

What is the difference between the two גירסאות?

Why is an arched door frame which starts to arch from the bottom of the side posts not obligated in mezuzah?

Is it only when lacking width of 4 tefachim with a minimum height of 3 tefachim or is it because a door frame needs to have straight side posts and a flat lintel?

Learn “ח’ ר”ן “כיפה

Learn “ריטב”א “ר”מ מחייב

Learn רמב”ם ה’ מזוזה פרק ו הלכה ד

https://hebrewbooks.org/pdfpager.aspx?req=58957&st=&pgnum=244&hilite=

And שולחן ערוך יו”ד ס’ רפ”ז

https://hebrewbooks.org/pdfpager.aspx?req=9732&st=&pgnum=478

Learn גמרא דף יא: “אשכחיה רב ששת (seven lines before the Mishna) until the Mishna.

Clarify what the concept of חוקקין להשלים 

See רש”י “חייבת which brings two גירסאות  in the gemara. Rashi says this gemara is a proof that the side posts do not need to touch the top post.  

What is the proof?

Is the proof only from the opinion of the Rabanan or also from Rebbe Meir?

What is the difference between the two גירסאות?

Why is an arched doorframe which starts to arch from the bottom of the side posts not obligated in mezuzah?

Is it only when lacking width of 4 tefachim with a minimum height of 3 tefachim or is it because a doorframe needs to have straight side posts and a flat lintel?

Learn “ח’ ר”ן “כיפה

Learn “ריטב”א “ר”מ מחייב

Learn רמב”ם ה’ מזוזה פרק ו הלכה ד

https://hebrewbooks.org/pdfpager.aspx?req=58957&st=&pgnum=244&hilite=

And שולחן ארוך יו”ד ס’ רפ”ז

https://hebrewbooks.org/pdfpager.aspx?req=9732&st=&pgnum=478

Quickly review משנה ברורה ס’ שס”ב ס”ק סו which discusses a machlokes whether the top crossbeam/ string needs to be taught so it will not sway in the wind. 

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=55

Why do the יש מחמירים disqualify a צורת הפתח which the top string sways in the wind?

According to the יש מחמירים how much swaying is acceptable?

The Mishna Berurah brings the opinion of the מחצית השקל that is based on a phenomenal chidush in what creates the mechitza of a צורת הפתח 

Learn the חזון איש או”ח ס’ ע”ז ס”ק ו (in the back of some prints of the Mishna Berurah)

https://hebrewbooks.org/pdfpager.aspx?req=14336&st=&pgnum=238

According to the חזון איש when is the top string swaying an issue and why?

Other opinions on amount of swaying in the wind. 

See ערוך השולחן או”ח ס’ שס”ב סע’ לז

https://hebrewbooks.org/pdfpager.aspx?req=9101&st=&pgnum=429

See  אג”מ או”ח ח”ה ס’ מ אות ב (in middle)

https://hebrewbooks.org/pdfpager.aspx?req=922&st=&pgnum=176

See אמרי יושר ח”ב ס’ קל”ג 

https://hebrewbooks.org/pdfpager.aspx?req=609&st=&pgnum=397&hilite=

Learn גמרא דף יא: “אשכחיה רב ששת (seven lines before the Mishna) until the Mishna

Clarify what the concept of חוקקין להשלים  and what the machlokes is. 

Very quickly review גמרא דף יא: “גופא (tenth wide line) until “אשכחיה רב ששת ” (seven lines before the next Mishnah) 

Review

שולחן ארוך או”ח ס’ שס”ב סעיף יא

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=54

Learn משנה ברורה ס”ק סו which discusses a machlokes whether the top crossbeam/ string needs to be taught so it will not sway in the wind.

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=55

What is the issue of the top string swaying in the wind?

How much swaying is acceptable?

The Mishna Berurah brings the opinion of the מחצית השקל that is based on a phenomenal chidush in what creates the mechitza of a צורת הפתח 

Learn the חזון איש או”ח ס’ ע”ז ס”ק ו (in the back of some prints of the Mishna Berurah) who

https://hebrewbooks.org/pdfpager.aspx?req=14336&st=&pgnum=238

1. Disagrees on the מחצית השקל opinion of what creates the mechitza from a צורת הפתח 

2. Explains the issue of swaying in the wind 

3. Gives an amount of how much swaying will disqualify

Other opinions on amount of swaying in the wind. 

See ערוך השולחן או”ח ס’ שס”ב סע’ לז

https://hebrewbooks.org/pdfpager.aspx?req=9101&st=&pgnum=429

See  אג”מ או”ח ח”ה ס’ מ אות ב (in middle)

https://hebrewbooks.org/pdfpager.aspx?req=922&st=&pgnum=176

See אמרי יושר ח”ב ס’ קל”ג 

https://hebrewbooks.org/pdfpager.aspx?req=609&st=&pgnum=397&hilite=

Learn גמרא דף יא: “גופא (tenth wide line) until “אשכחיה רב ששת ” (seven lines before the next Mishnah) 

The gemara lists three halachos in regards to a צורת הפתח 

1. The strength of the צורת הפתח 

2. Requirement to have a היכר ציר – a hole to place the peg for the door

3. Whether the side posts need to extend all the way until the horizontal cross beam/string

How do we rule l’halacha?

Learn שולחן ארוך או”ח ס’ שס”ב סעיף יא 

Why doesn’t the Shulchan Aruch require a היכר ציר as the gemara states this requirement without any opinions who disagreed? 

Learn משנה ברורה ס”ק ס – סג 

Why does the top string have a leniency over the side posts? 

Learn משנה ברורה ס”ק סו 

Note how the Mishna Berurah explains the mechanics of a צורת הפתח 

What is the issue of the top string swaying in the wind?

How much swaying is acceptable?

Quickly review the שולחן ארוך או”ח ס’ שס”ב סעיף י and the משנה ברורה 

Clarify: 

How does the Shulchan Aruch rule in regards to 

A צורת הפתח on an opening wider than 10 Amos?

Openings which are פרוץ מרובה  which are less than 10 Amos wide?

Openings which are פרוץ מרובה which are wider than 10 Amos?

Is an עירוב constructed entirely from צורת הפתח from all four sides valid?

Learn ביאור הלכה  “אבל בבקעה” & “כשכל

Learn גמרא דף יא: “גופא (tenth wide line) until “אשכחיה רב ששת ” (seven lines before the next Mishnah) 

The gemara lists three halachos in regards to a צורת הפתח 

1. The strength of the צורת הפתח 

2. Requirement to have a היכר ציר – a hole to place the peg for the door

3. Whether the side posts need to extend all the way until the horizontal cross beam/string

How do we rule l’halacha?

Learn שולחן ארוך או”ח ס’ שס”ב סעיף יא 

Why doesn’t the Shulchan Aruch require a היכר ציר as the gemara states this requirement without any opinions who disagreed? 

Learn משנה ברורה ס”ק ס – סג  and ס”ק סו 

Why is the top string have a leniency over the side posts? 

Learn שולחן ארוך או”ח ס’ שס”ב סעיף יא and the משנה ברורה ס”ק ס – סג  and ס”ק סו 

Here are the 3 pages in the Mishnah Berurah that are referenced in the shiur:

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=53

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=54

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=55

Today’s plan is to conclude the explanation of the Rambam in regards to צורת הפתח on an opening wider than 10 Amos which is פרוץ מרובה.

How does the Shulchan Aruch rule in regards to צורת הפתח on an opening wider than 10 Amos?

Openings which are פרוץ מרובה  which are less than 10 Amos wide?

Openings which are פרוץ מרובה which are wider than 10 Amos?

Learn שולחן ארוך או”ח ס’ שס”ב סעיף י and the משנה ברורה 

Is an עירוב constructed entirely from צורת הפתח from all four sides valid?

Learn ביאור הלכה “כשכל

Learn ביאור הלכה “ולהרמב”ם for a new explanation of the Rambam and answer to the questions we asked on the Rambam the last few days. 

Complete learning the ר’ חיים, רמב”ם ה’ שבת ט”ז, ט”ז 

In conclusion what is ר’ חיים  explanation for the Rambam 

https://hebrewbooks.org/pdfpager.aspx?req=61915&st=&pgnum=39&hilite=

Learn גמרא דף יא: “גופא (tenth wide line) until “אשכחיה רב ששת ” (seven lines before the next Mishnah) 

The gemara lists three halachos in regards to a צורת הפתח 

1. The strength of the צורת הפתח 

2. Requirement to have a היכר ציר – a hole to place the peg for the door

3. Whether the side posts need to extend all the way until the horizontal cross beam/string

How do we rule l’halacha?

Learn שולחן ארוך או”ח ס’ שס”ב סעיף יא and the משנה ברורה ס”ק ס – סג  and ס”ק סו 

Quickly review רמב”ם ה’ שבת פרק טז הלכה טז 

https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=70

We asked the two following questions on the Rambam

1. The Rambam concludes that each situation individually a צורת הפתח is valid. However when both are combined in a case of an opening wider than 10 Amos and פרוץ מרובה על העומד than it is disqualified.  

If each situation independently is valid, why is the combination deadly?

2. Our Gemara said the source to disqualify a צורת הפתח  when there are more openings than closures – פרוץ מרובה על העומד is from the halacha of Rav who rules a צורת הפתח can not close an opening wider than 10 Amos. Since the Rambam concludes a צורת הפתח is valid on an opening wider than 10 Amos where is the source to disqualify it when there is  פרוץ מרובה על העומד ?

Learn מגיד משנה for an answer 

Learn ר’ חיים על הרמב”ם שבת טז, טז who gives fundamental principles in Hilchos Mechitzas

https://hebrewbooks.org/pdfpager.aspx?req=61915&st=&pgnum=39&hilite=

Breakdown the ר’ חיים to segments 

1. The two aspects of a צורת הפתח 

2. How a צורת הפתח on an opening is better than without one even when the opening is less than 10 Amos

3. The bearing עומד מרובה has to the opening in the mechitza. 

4. The difference between a solid mechitza and a צורת הפתח which acts as a mechitza. 

Halachic Conclusion:

How do we conclude l’halacha regarding; 

Placing a צורת הפתח on an opening wider than 10 Amos?

Placing a צורת הפתח on multiple openings which are פרוץ מרובה על העומד and less than 10 Amos ?

Learn רמב”ם ה’ שבת פרק טז הלכה טז 

https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=70

Major Question:

The Rambam concludes that each situation individually a צורת הפתח is valid. However when both are combined in a case of an opening wider than 10 Amos and פרוץ מרובה על העומד than it is disqualified.  

If each situation independently is valid, why is the combination deadly?

Our Gemara said the source to disqualify a צורת הפתח  when there are more openings than closures – פרוץ מרובה על העומד is from the halacha of Rav who rules a צורת הפתח can not close an opening wider than 10 Amos. Since the Rambam concludes a צורת הפתח is valid on an opening wider than 10 Amos where is the source to disqualify it when there is  פרוץ מרובה על העומד ?

Learn מגיד משנה for an answer 

Learn ר’ חיים על הרמב”ם שבת טז, טז who gives fundamental principles in Hilchos Mechitzas

https://hebrewbooks.org/pdfpager.aspx?req=61915&st=&pgnum=39&hilite=

The גמרא דף יא until the two dots on דף יא עמוד ב brings the opinion of רב that a צורת הפתח can not close an opening wider than 10 Amos. 

Rav Yosef understands that רב would also disqualify multiple צורת הפתח on openings less than 10 Amos if there are more openings than closures – פרוץ מרובה על העומד.  The Gemara tries to prove this position but is unsuccessful. 

The Gemara also attempts to bring a proof that ר’ יוחנן agrees to the opinion of רב that a צורת הפתח can not close an opening wider than 10 Amos but does not have a source. 

How do we conclude l’halacha?

Learn ח’ ר”ן דף יא: “לעולם 

Learn רמב”ם ה’ שבת פרק טז הלכה טז 

Note how the Ramabam rules

Major Question:

The Rambam concludes that each situation individually a צורת הפתח is valid. However when both are combined in a case of an opening wider than 10 Amos and פרוץ מרובה על העומד than it is disqualified.  

If each situation independently is valid, why is the combination deadly?

Our Gemara said the source to disqualify a צורת הפתח  when there are more openings than closures – פרוץ מרובה על העומד is from the halacha of Rav who rules a צורת הפתח can not close an opening wider than 10 Amos. Since the Rambam concludes a צורת הפתח is valid on an opening wider than 10 Amos where is the source to disqualify it when there is  פרוץ מרובה על העומד ?

Learn מגיד משנה for an answer 

Learn ר’ חיים על הרמב”ם שבת טז, טז who gives fundamental principles in Hilchos Mechitzas

Learn  the גמרא דף יא. “ורמי” (second line from bottom of the Amud) until the two dots on דף יא עמוד ב 

Conclusion of Topic: צורת הפתח מן הצד

We discussed three opinions in the Rishonim (רש”י, ר”ח & ריף) for what is the case of צורת הפתח מן הצד

Learn רשב”א who asks multiple questions on the explanation of the ר”ח and ריף with a possible answer for them

https://hebrewbooks.org/pdfpager.aspx?req=37275&st=&pgnum=15

According to Rashi if the top string is wrapped on the side of the pole at the top is it acceptable?

Learn ט”ז ס’ שס”ג ס”ק ד

Is a צורת הפתח made by placing the top string on in between a groove on top of the vertical post acceptable? 

Learn שולחן ארוך או”ח ס’ שס”ב סע’י יא 

See and משנה ברורה ס”ק סד which discusses the two halachos above and other details of צורת הפתח מן הצד

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=54

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=55

Learn the גמרא דף יא. “ואף ר’ יוחנן” (sixteen lines from bottom of Amud) until “ורמי” (second line from bottom of the Amud)

Topic: צורת הפתח מן הצד

What is the case?

There are multiple explanation in the Rishonim

See רש”י דף יא “מן הצד

See רבינו חננאל (on side of gemara)

See ריף

https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=329

Learn רשב”א who asks multiple questions on the explanation of the ר”ח and ריף

https://hebrewbooks.org/pdfpager.aspx?req=37275&st=&pgnum=15

According to Rashi if the top string is wrapped on the side of the pole at the top is it acceptable?

Learn ט”ז ס’ שס”ג ס”ק ד

How to we conclude l’halacha 

Learn שולחן ארוך או”ח ס’ שס”ב סע’י יא 

See and משנה ברורה ס”ק סד which discusses many details of צורת הפתח מן הצד

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=54

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=55

Why would צורת הפתח be acceptable for כלאים but not for Shabbos?

Learn תוס’ “אילימא 

Very quickly review the גמרא דף יא. “אמר רב כהנא until “ואף ר’ יוחנן” (sixteen lines from bottom of Amud) 

Topic: פיתחתי שימאי

Learn שולחן ארוך או”ח ס’ שס”ג סע’ ז and משנה ברורה ס”ק כה

Learn משנה ברורה או”ח ס’ שס”ג ס”ק קיג  

Learn the גמרא דף יא. “ואף ר’ יוחנן” (sixteen lines from bottom of Amud) until “ורמי” (second line from bottom of the Amud)

Topic: צורת הפתח מן הצד

What is the case?

There are multiple explanation in the Rishonim

See “רש”י דף יא “מן הצד

See רבינו חננאל (on side of gemara)

See ריף

Learn רשב”א 

Learn שולחן ארוך או”ח ס’ שס”ב סע’י יא and משנה ברורה ס”ק סד which discusses many details of צורת הפתח מן הצד 

Very quickly review the גמרא דף יא “אמר רב יוסף (ten lines from top of Amud) until “אמר רב כהנא “

Learn “תוס’ “חצר
Based on Tosfos answer what is the logic of comparing a פירצה wider than 10 Amos to פרוץ מרובה from all four sides which each פירצה is less than 10 Amos?

Continue learning the גמרא דף יא. “אמר רב כהנא until “ואף ר’ יוחנן” (sixteen lines from bottom of Amud)
Topic: פיתחתי שימאי
Learn שולחן ארוך או”ח ס’ שס”ג סע’ ז and משנה ברורה ס”ק כה
Learn משנה ברורה או”ח ס’ שס”ג ס”ק קיג

Review the “גמרא דף יא. “מתני (eight lines from top of Amud) until “אמר רב כהנא ” 

Learn תוס’ “חצר 

Sugya: צורת הפתח

Halachic Conclusion:

Does a Lechi need to be placed within three tefachim of the sidewall if the Lechi is wider then the gap adjacent to it?

Learn שולחן ארוך או”ח ס’ שס”ג סעיף ו and משנה ברורה ס”ק כב 

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=57

Does the vertical post of a Tzuras Hapesach also need to be placed within three tefachim of the wall?

Would it matter how much space is between the vertical post of a Tzuras Hapesach and the side wall? 

See משנה ברורה ס”ק כג and  “ביאור הלכה “צריך

Learn the “גמרא דף יא “מתני (eight lines from top of Amud) until “אמר רב יוסף” (ten lines from top of Amud) 

Continue learning the גמרא דף יא “אמר רב יוסף  (ten lines from top of Amud) until “אמר רב כהנא ” 

Learn תוס’ “חצר 

Sugya: צורת הפתח

Halachic Conclusion:

Does the vertical post of a Tzuras Hapesach also need to be placed within three tefachim of the wall?

See בכור שור and שו”ת רע”א ח”א ס’ י”ח

https://hebrewbooks.org/pdfpager.aspx?req=1161&st=&pgnum=25

https://hebrewbooks.org/pdfpager.aspx?req=1161&st=&pgnum=26

See  מקור חיים – תיקון עירובין for a third opinion 

Question:

What is the status of the opening of a Tzuras Hapesach. Do we consider it as closed?

Can we use the width of the span of the Tzuras Hapesach for עמוד מרובה?

Learn “גאון יעקב דף יא. “איפכא

And “שפת אמת דף יא. “תוס’ “איפכא” &  דף ו. “ולחי 

How do we conclude l’halacha?

Learn שולחן ארוך או”ח ס’ שס”ג סעיף ו with the משנה ברורה  and ביאור הלכה “צריך

Learn the “גמרא דף יא “מתני (eight lines from top of Amud) until “אמר רב יוסף” (ten lines from top of Amud)

Review the גמרא דף יא “איפכא מאי (top of the Amud) until “מתני לה” (eight lines from top of the Amud) 

Continue learning the Gemara until “אמר רב יוסף ” 

Sugya: צורת הפתח

Point to consider – What is the status of the opening of a Tzuras Hapesach.  Do we consider it as closed?

Can we use the width of the span of the Tzuras Hapesach for עמוד מרובה ?

Learn ‘תוס’ דף יא “איפכא 

Tosfos lists three differences between a Lechi and a Tzuras Hapesach 

Question:

Tosfos דף י: “ועושה quoted the גמרא דף יד that a Lechi needs to placed within three tefachim of the wall. 

Why does the Lechi need to be within three tefachim of the wall?

See רבינו יהונתן דף יד: על המשנה “ר’ יוסי

https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=332

Does Tosfos agree to the reason of רבינו יהונתן?

Learn מגן אברהם ס’ שס”ג ס”ק ה

https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=231

Does the vertical post of a Tzuras Hapesach also need to be placed within three tefachim of the wall?

Bring a proof from tosfos. 

See תוס’ רבינו פרץ  

There is a big discussion in the achronim regarding this.

See בכור שור and שו”ת רע”א ח”א ס’ י”ח

https://hebrewbooks.org/pdfpager.aspx?req=1161&st=&pgnum=25

https://hebrewbooks.org/pdfpager.aspx?req=1161&st=&pgnum=26

See  מקור חיים – תיקון עירובין for a third opinion 

How do we conclude l’halacha?

Learn שולחן ארוך או”ח ס’ שס”ג סעיף ו with the משנה ברורה  and ביאור הלכה “צריך

Quickly review the גמרא דף י עמוד ב “אם יש לו צורת הפתח (two dots – four lines form bottom of the Amud) until “מתני לה” (eight lines from top of the Amud)

Sugya: אמלתרא 

Major Question:

The gemara inquires whether an אמלתרא would help a Korah be a valid Tikun for a Mavui whose opening is wider than 10 Amos. The Gemara (3a) said the benefit of an אמלתרא is that it attracts attention and makes the Korah noticable therefore a Korah with an אמלתרא can be placed higher than 20 Amos. An opening wider than 10 Amos is considered a Pirtzah. How could an אמלתרא help for an opening wider than 10 Amos as the issue is entirely different?

See ב”ח ס’ שס”ג סעיף כו

https://hebrewbooks.org/pdfpager.aspx?req=14268&st=&pgnum=138

And שפת אמת דף ג. לא תהני

https://hebrewbooks.org/pdfpager.aspx?req=14521&st=&pgnum=185

How do we conclude l’halacha regarding whether an אמלתרא can help for an opening wider than 10 Amos? 

Sugya: צורת הפתח

Learn ‘תוס’ דף יא “איפכא 

Tosfos lists three differences between a Lechi and a Tzuras Hapesach 

Question:

Tosfos דף י: “ועושה quoted the גמרא דף יד that a Lechi needs to placed within three tefachim of the wall. 

Why does the Lechi need to be within three tefachim of the wall?

See רבינו יהונתן דף יד: על המשנה “ר’ יוסי

https://hebrewbooks.org/pdfpager.aspx?req=14312&st=&pgnum=332

Does Tosfos agree to the reason of רבינו יהונתן?

Learn מגן אברהם ס’ שס”ג ס”ק ה

https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=231

Does the vertical post of a Tzuras Hapesach also need to be placed within three tefachim of the wall?

Bring a proof from tosfos. 

See תוס’ רבינו פרץ  

There is a big discussion in the achronim regarding this 

See בכור שור , שו”ת רע”א ח”א ס’ י”ח & מקור חיים – תיקון עירובין

Conclusion of אתי אוירא מהאי גיסא ואוירא מהאי גיסא ומבטלה 

Question:

In the case of עור העסלא (on bottom of דף י עמוד ב) if the total width of the seat is one tefach it is an אהל לטומאה. We discussed earlier a concept of אתי אוירא מהאי גיסא ואוירא מהאי גיסא ומבטלה. Why when the space between the two solid planks is equal or larger than the solid part don’t we apply the rule of אתי אוירא?  The solid part of the seat should be negated and no longer considered an אהל לטומאה ?

Learn “תוס’ “ואצבעיים who explains some principles of when we do not apply the concept of אתי אוירא מהאי גיסא ואוירא מהאי גיסא ומבטלה

Quickly review the משנה דף ב

Learn the גמרא דף י עמוד ב “אם יש לו צורת הפתח (two dots – four lines form bottom of the Amud) until “מתני לה” (eight lines from top of the Amud)

Sugya: אמלתרא

Major Question:

The gemara inquires whether an אמלתרא would help a Korah be a valid Tikun for a Mavui whose opening is wider than 10 Amos. The Gemara (3a) said the benefit of an אמלתרא is that it attracts attention and makes the Korah noticable therefore a Korah with an אמלתרא can be placed higher than 20 Amos. An opening wider than 10 Amos is considered a Pirtzah. How could an אמלתרא help for an opening wider than 10 Amos as the issue is entirely different?

See ב”ח ס’ שס”ג סעיף כו

And שפת אמת דף ג. לא תהני

How do we conclude l’halacha regarding whether an אמלתרא can help for an opening wider than 10 Amos? 

Sugya: צורת הפתח

Learn ‘תוס’ דף יט “איפכא