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