Very quickly review the גמרא דף ה: “אמר רב חנן בר רבא (two dots on bottom of the Amud) until אמר רב נחמן בר יצחק ((nine lines from top of the Amud)
Questions:
What is the reason why רב הונא says the allowed size of a פירצה on side wall is only up to 4 Tefachim and not 10 Amos ?
Why does this reason not apply to the front wall at the entrance to the Mavui?
Review “תוס’ ו. “אחד (second half)
See גמרא דף ה. “איתמר משמיה דרב אמי ורב אסי (middle of the Amud) until “לרב יוסף
Learn רש”י דף ה carefully
Learn ריטב”א דף ו. “רב הונא אמר אחד זה
https://hebrewbooks.org/pdfpager.aspx?req=37287&st=&pgnum=9
According to the Ritva that רב הונא halacha applies even to the front wall at the entrance to the Mavui the reason Tosfos says for רב הונא does not apply.
What is the Ritva explanation of the opinion of רב הונא?
Continue learning the Gemara until the two dots (six lines from bottom of the Amud)
(Focus on the argument of רב חנן בר רבא and רב הונא for the size of פירצה on side wall – we will come back to the Sugya of מבוי עקום after we finish this topic)
Clarify what case רב הונא agrees the size of פירצה on side wall could be 10 Amos.
What is the explanation for the different circumstances that affect the allowance of the size of פירצה on side wall?