Category: Morning Chabura

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 

Learn the גמרא דף י: “תנן התם  (middle of the Amud) until the two dots.

Questions:

Why don’t we consider the airspace between the pieces of leather as closed with the concept of לבוד? 

Learn “תוס’ “עור

And רשב”א  who gives a different answer. 

What are the principles of when we do not apply the concept of אתי אוירא מהאי גיסא ואוירא מהאי גיסא ומבטלה?

Learn “תוס’ “ואצבעיים   

ery quickly review the “גמרא דף י: “וליחוש (seventeen lines from top of the Amud) until “תנן התם” 

The gemara says we are not concerned that people will abandon the larger opening for the smaller opening unless there is a gain of a shortcut. 

What happens if the people actually do abandon the larger opening?

Learn שולחן ארוך או”ח ס’ שס”ג סע’ לד with the משנה ברורה

Is the Shulchan Aruch explaining the issue of abandoning the larger opening like Rashi or the Meiri?

See

The Shulchan Aruch says placing a tzuras hapesach on the smaller opening will allow one to carry inside the mavui. Could one place a Lechi or Korah instead?

See ה’ רע”א who questions why placing a tzuras hapesach on the smaller opening will allow one to carry inside the mavui?

See משנה ברורה ס”ק ק”נ 

Continue learning the גמרא דף י: “תנן התם  (middle of the Amud) until the two dots.

Learn “תוס’ “עור

Learn “תוס’ “ואצבעיים   

Quickly review the גמרא דף י: “וליחוש (seventeen lines from top of the Amud) until “תנן התם” 

The Gemara discusses a case where the fourth side of the Mavui is 15 Amos wide and places a board 3 Amos wide leaving a gap of space of 2 Amos between the board and the wall. 

Questions:

What is the problem if the people stop traveling through the larger opening and only go through the smaller opening? 

Rashi says one reason 

See ח’ מאירי “וליחוש  who says a different reason. 

Does one need to place a Lechi or Korah for the gap of 2 Amos? 

Learn חידושי מאירי beginning of of דף י עמוד ב who quotes the Raavad 

Does one need to place a Lechi or Korah in addition to the פס for the opening of 10 Amos? 

See “תוס’ “ועושה who says he needs a Lechi or Korah 

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

Learn מגן אברהם ס’ שס”ג ס”ק ה who explains there is a dispute between Tosfos and רבינו יהונתן?

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

In the case where the entrance to the Mavui is 20 Amos wide and places a board four Amos long in the middle of the entrance in the direction of the side walls. 

Does one need to place a Lechi or Korah on only one of the openings or on both?

See רש”י דף ה. “מתיר בפרצה

The gemara says we are not concerned that people will abandon the larger opening for the smaller opening unless there is a gain of a shortcut. 

What happens if the people actually do abandon the larger opening?

See שולחן ארוך או”ח ס’ שס””ג סע’ לד and משנה ברורה ס”ק נ 

Learn the גמרא דף י: “וליחוש (seventeen lines from top of the Amud) until “תנן התם” 

This gemara is a continuation from the Gemara last week.  

Does one need to place a Lechi or Korah in addition to the פס?

If yes, where?

Learn חידושי מאירי  

Learn “תוס’ “ועושה

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

Zoom link for those who can not attend live.

Same zoom link for the entire morning

https://us02web.zoom.us/j/98313738910?pwd=S0NzYThFSG01S05KcTEybmxrY2JGZz09

Quickly review the גמרא דף י: “אי נמי until “וליחוש”

The Gemara introduces four concepts

1. פרוץ מרובה על העומד

2. עומד מרובה משני רוחות 

3. פרוץ כעומד

4. אתי אוירא .. ומבטלה 

According to the opinion that עומד מרובה משני רוחות  is considered עומד מרובה does it have exactly the same status of עומד מרובה or is it a lower tier?

The gemara says it’s possible that פרוץ כעומד is good yet we still would say אתי אוירא מהאי גיסא ואוירא מהאי גיסא ומבטלה. If פרוץ  is indeed כעומד why should it be any different than when the Amud is larger than the adjacent gap of air in which we do not say אתי אוירא ומבטלה? 

Learn רש”ש 

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

On דף ה עמוד ב we discussed a ח’ גרי”ז בכורות דף יז who brings a proof from רמב”ם to the same principle of the רש”ש.

Is there a benefit with any of these options more than the solution that Rav Yehuda presented?

Learn “תוס’ “ואמאי 

Does one need to place a Lechi or Korah in addition to the פס?

If yes, where?

Learn חידושי מאירי  

Learn “תוס’ “ועושה

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

Quickly review the גמרא דף י: “אי נמי until “וליחוש”

Clarify the four concepts the gemara introduces 

1. פרוץ מרובה על העומד

2. עומד מרובה משני רוחות 

3. פרוץ כעומד

4. אתי אוירא .. ומבטלה 

Why don’t we consider the remaining opening of ten Amos to be פרוץ מרובה  from the Amud adjacent to it?

See ח’ מאירי דף י (In middle) from “ואע”ג דפרוץ דפתח מרובה 

The gemara says it’s possible that פרוץ כעומד is good yet we still would say אתי אוירא מהאי גיסא ואוירא מהאי גיסא ומבטלה. If פרוץ  is indeed כעומד why should it be any different than when the Amud is larger than the adjacent gap of air in which we do not say אתי אוירא ומבטלה? 

Learn רש”ש 

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

On דף ה עמוד ב we discussed a ח’ גרי”ז בכורות דף יז who brings a proof from רמב”ם to the same principle of the רש”ש.

Is there a benefit with any of these options more than the solution that Rav Yehuda presented?

Learn “תוס’ “ואמאי 

Does one need to place a Lechi or Korah in addition to the פס?

If yes, where?

Learn חידושי מאירי  

Learn “תוס’ “ועושה

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

Zoom link for those who can not attend live.

Same zoom link for the entire morning

https://us02web.zoom.us/j/98313738910?pwd=S0NzYThFSG01S05KcTEybmxrY2JGZz09