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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