Rabbi Baruch Bodenheim: Gemara Eruvin: Second Perek, יום שני Sivan 25, Daf 25b (07/01/24)

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Learn תוס’ “וכי

Learn תוס’ “קרפף

Question:

Why does the Gemara consider the חצר to be added to the קרפף but not vice versa?

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https://hebrewbooks.org/pdfpager.aspx?req=14053&st=&pgnum=121

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Draw a diagram of the scenario of the Gemara according to Rashi & according to Tosfos. 

Questions:

How are they different?

Why does Tosfos explain the case differently from Rashi?