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Review גמרא דף יד “היו אחת למעלה (thirteen lines before the medium lines) until the two dots (two lines before the medium size lines)
Do the Rabanan (Mishna 13b) who disqualify קורה that is not בריאה לקבל אריח also permit two קורות at different height elevations?
Learn רא”ש ס’ יח’ (in middle)
Learn ריטב”א דף יד. “ר’ יוסי בר’ יהודה
https://hebrewbooks.org/pdfpager.aspx?req=37287&st=&pgnum=22
Is there a limit to the height distance between two קורות placed at different height elevations?
Learn תוס’ דף יד. “ובלבד
Learn רמב”ם ה’ שבת פרק י”ז הלכה כה with the מגיד משנה who explains the Rambam argues on רבינו יהונתן and asks on the Rambam how could we combine two קורות that are at different elevations even with distance greater then three tefachim when the Gemara Sukkah says we do not combine them when the width of the beam is less than a tefach wide (same question as תוס’ “ובלבד) ?
Learn כסף משנה for a different explanation in the Rambam and different answer to Tosfos question
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=77
Learn שולחן ארוך ס’ שס”ג סע’ כג
https://hebrewbooks.org/pdfpager.aspx?req=60389&st=&pgnum=61
Learn 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)
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)