Tosfos DH v'Halachah says that the case of the Gemara must be a thick fig because if it was a hole for which we dont say Chokikin l'Hashlim (too small) then why would it be chaiv under ten; it wouldnt be placed on an area of 4x4.
My question is...if it is 4x4 then why would it be chaiv? Shouldn't it be considered a placement on a makom petur or karmilis? I guess you can ask the question on the gemara itself.
Elie Weinstein, Brooklyn, NY
The Gemara is explaining now according to the opinion that Chorei Reshus ha'Rabim has the Din of Reshus ha'Rabim Min ha'Torah, and so if it has an area of 4 by 4 Tefachim less than 10 Tefachim from the ground, it is a proper Reshus ha'Rabim.
All the best,
Reuven Weiner