Rabbi Baruch Bodenheim: Gemara Eruvin: First Perek, יום רביעי Shevat 17, Daf 7a (02/08/23)

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Learn the גמרא דף ז. “יתיב רב יוסף (two dots) until אמר ליה אביי (second to last line of the amud) 

Learn תוס’ “בקעה 

Clarify the case of מבוי שכלה לרחבה

Learn תוס’ “אם 

Continue learning the גמרא דף ז. ” אמר ליה אביי (second to last line of the amud) until דף ז: “השתא (five lines from bottom of the Amud) 

Clarify the case of מבוי שנפרץ במלואו לחצר ונפרצה חצר כנגדו

What are the two points how the ruling of רב contradicts the ruling of the case of מבוי שכלה לרחבה

Continue learning the גמרא דף ז: “השתא (five lines from bottom of the Amud) until the bottom of the Amud

Conclusion of the Sugya: Following a בת קול

Clarify the two reasons  “תוס’ דף ו: “כאן gives as to why the Chachamim were allowed to ignore the בת קול in the episode related in גמרא בבא מציעא דף נט עמוד ב?

Questions:

What’s the nafka minah between these two reasons?

Why did the Bas Kol say to follow Rebbe Eliezer if that was not the Halacha? 

See רב ניסן גאון on the side of the גמרא ברכות דף יט עמוד א

https://hebrewbooks.org/shas.aspx?mesechta=1&daf=19&format=pdf

According to the second explanation of Tosfos, we do not rule like a Bas Kol. Why do we follow the Bas Kol that said the halacha is like Beis Hillel? 

Based on the conclusion of Tosfos, how many opinions are there in regards to following a Bas Kol? (list the opinions)