Learn the second “בעא מיניה אביי מרבה” (sixth wide line) until the third בעא מיניה אביי (middle of the Amud)
Questions:
What is the uncertainty of אביי?
Why does אביי have reason to believe ר’ יהודה would have a different position than ר’ מאיר in regards to this question?
There are three explanations in the Rishonim
1. Learn Rashi
2. Learn רשב”א
3. Learn רמב”ם ה’ שבת פרק יז הלכה כט and the ח’ ר”ן
Learn תוס’ “ואם
Bring a proof from תוס according to which of the three explanations of the first inquiry of אביי he is aligned with.
The Gemara quotes ר”י who says there is a difference in size of gaps between פסי ביראות (allowed 13 1/3 Amos) and מחיצות (allowed 10 Amos). This contradicts what ר”י said in the first Mishna that the fourth side of a mavui can have gap of 13 1/3 Amos?
Learn ריטב”א for an answer
Learn the third “בעא מיניה אביי מרבה” (middle of the Amud) until the fourth בעא מיניה אביי (nine lines from the bottom of the Amud)
Question:
Why is it necessary to view the תל המתלקט as carved out in order to be an acceptable דיומד? Why is it not sufficient the fact that their is an Amah of a mechitza on each side?
Why does a round pillar need to be viewed as carved out and squared in order to be an acceptable דיומד? Why does it matter that the outside face plate is round? (See שפת אמת)
There are two approaches to answer these questions
Learn חזון איש
Learn ח’ מהר”ל