The Sage who permits doing so holds that it is permitted since in the yard itself there are no residents, and a place without residents cannot prohibit carrying in another, adjacent domain. And the Sage who prohibits doing so holds that it is prohibited because sometimes there are residents in it who can prohibit carrying in the other domain, and people might unwittingly come to carry from the yard to the town in their usual manner, even though it is prohibited.
קרפף יותר מבית סאתים שלא הוקף לדירה ובא למעטו, מיעטו באילנות — לא הוי מיעוט.
With regard to a karpef that measures more than two beit se’a and that had not been fenced in from the outset for the purpose of residence, and one came to reduce its size, if he reduced it by planting trees in a section of the space, it is not a valid reduction, because trees are commonly found in a karpef designed for residence; therefore, they are not considered something out of the ordinary that would reduce its size.
בנה בו עמוד גבוה עשרה ורחב ארבעה — הוי מיעוט. פחות משלשה — לא הוי מיעוט. משלשה ועד ארבעה — רבה אמר: הוי מיעוט, ורבא אמר: לא הוי מיעוט.
But if he built up a column 10 handbreadths high and 4 handbreadths wide, it is an effective reduction, i.e., if the karpef is thereby reduced to the area of two beit se’a, one is permitted to carry within it. However, if the column is less than 3 handbreadths wide, it is not an effective reduction. And if it is between 3 to 4 handbreadths wide, there is a dispute between amora’im. Rabba said: It constitutes an effective reduction, and Rava said: It does not constitute an effective reduction.
רבה אמר: הוי מיעוט, דהא נפיק ליה מתורת לבוד. רבא אמר: לא הוי מיעוט, כיון דלא הוי מקום ארבעה — לא חשיב.
The Talmud explains the two opinions. Rabba said that it constitutes an effective reduction because it is large enough to be excluded from the principle of lavud, namely, that solid surfaces with gaps between them less than 3 handbreadths are considered joined. Since the column stands independently, it reduces the size of the karpef. Rava said that it does not constitute a valid reduction because as it is not a place of at least 4 handbreadths, it is not significant. An area of less than 4 handbreadths is not considered independent.