Rabbi Baruch Bodenheim: Gemara Eruvin: Second Perek, יום שלישי Cheshvan 2, Daf 17b – 18a (10/17/23)

Review the first half of the משנה דף יז עמוד ב beginning of the Second Perek until “מותר” (last word on the Amud) 

Questions

Is פסי ביראות an exception to the rule that פרוץ מרובה is Pasul?

Learn “תוס’ “עושין

Learn רשב”א/ריטב”א who quotes the ראב”ד who gives a different explanation than Tosfos.

https://hebrewbooks.org/pdfpager.aspx?req=37275&st=&pgnum=23

https://hebrewbooks.org/pdfpager.aspx?req=37287&st=&pgnum=28

Why does the רשב”א/ריטב”א disagree with the reason of the ראב”ד? 

Would three corners be accepted as פסי ביראות? 

Learn ח’ ר”ן “עושין (attached)

We discussed in the first perek the rule of אתי אוירא מהאי גיסא ומהאי גיסא ומבטלה -When the middle panel is smaller than the space on both sides of it the panel is negated. 

How does adding panels six tefachim wide in middle of the פסי ביראות according to ר”מ help reduce the size of the opening when the gaps between the panel and the פסי ביראות are larger than the panel? 

Learn “תוס’ “וארבעה

See how the תוס’ ישנים (in brackets) gives a different answer from Tosfos.

Learn ח’ ר”ן “ארבעה (attached) who gives a very different explanation.  

How wide do the panels in between the פסי ביראות need to be?

See רש”י, ריטב”א “גבהן” & ח’ ר”ן “ארבעה