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