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Today’s Daf Yomi Question:
How can a window which is merely four Tefachim wide provide access for a person who is wide an Amma (Sukkah 7b)?
The point here is not to be able to walk through. It is considered a valid opening and that is enough.
If it adds anything, the hypotenuse of a 4×4, using the multiply-by-1.4 formula, would come close to an Amma.
R’ Yonasan says that less than four is unsuitable to pass through.