Rabbi Baruch Bodenheim: Gemara Eruvin: First Perek, יום רביעי Av 29, Daf 14a-14b (08/16/23)

Conclusion of Sugya: “קורות אחת למעלה ואחת למטה 

Do the Rabanan (Mishna 13b) who disqualify קורה that is not בריאה לקבל אריח also permit two קורות at different height elevations? 

Machlokes between רא”ש ס’ יח’ (in middle) and ריטב”א דף יד. “ר’ יוסי בר’ יהודה  

https://hebrewbooks.org/pdfpager.aspx?req=37287&st=&pgnum=22

Tosfos ( דף יד. “ובלבד) quotes the Gemara Sukkah which limits the height distance between two קורות which are less than a tefach wide to three tefachim 

Learn רמב”ם ה’ שבת פרק י”ז הלכה כה with the מגיד משנה who explains the Rambam argues on Toafos and permits the two קורות that are at different elevations even with distance greater then three tefachim.

Question:

The Rambam in Hilchos Sukkah rules that pieces of schach less than a tefach each that are place at different height elevations can not combine if the distance between them is greater then three tefachim?

Learn כסף משנה for a different explanation in the Rambam plus an answer to this question.

https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=77

How do we conclude lhalacha?

Learn שולחן ארוך ס’ שס”ג סע’ כג 

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Review the גמרא דף יד. “ר’ יהודה אומר (three lines before the medium size lines) until “עגולה” (two dots – sixth line from bottom of the Amud) 

Questions:

Why according to the Rabanan does a קורה which is four tefachim wide not need to be strong enough to support a brick?

Is a four tefachim wide קורה made from straw or twigs kosher?

Learn ביאור הלכה ס’ שס”ג סע’ י”ז “חזקה

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=60

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=61

According to the opinion of the Shulchan Aruch סע’ כב that two קורות combined can only be maximum one tefach apart from one another. Could they combine to create a קורה which is four tefachim wide and therefore be allowed to be 2 1/2 tefachim apart from one another ? 

Learn ביאור הלכה ס’ שס”ג סע’ כב “בתוך טפח 

https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=61

What if the physical material of the קורות total four tefachim but there are gaps in between?

See השגת חזון איש 

Continue learning the גמרא דף יד. “עגולה  (two dots – sixth line from bottom of the Amud) until “תני ” (second to last line from bottom of the Amud)

Continue learning the Gemara until the משנה דף יד עמוד ב