Mishnayos Eruvin Perek 9 Mishnah 2

If a large roof was adjacent to a small roof, and the boundary between them was no wider than ten cubits, use of the large one is permitted, i.e., one may bring objects up to the roof from the house below and carry them on the roof, and use of the small one is prohibited. A similar halakha applies to a large courtyard that was breached into a small one, in a manner that one entire side of the small courtyard was breached, but the breach was less than ten cubits; it is permitted for the residents of the large courtyard to carry, but it is prohibited for the residents of the small one to do so. The rationale for this difference is because in that case, the legal status of the breach is like that of the entrance of the large courtyard. As the breach in the wall of the larger courtyard is surrounded on both sides by the remaining portions of that wall, and the breach is no greater than ten cubits wide, its legal status is like that of an entrance in the wall of the courtyard, and therefore it is permitted to carry in the large courtyard. With regard to the small courtyard, however, since one entire side of the small courtyard was breached, there remains no partition whatsoever on that side and carrying in that courtyard is therefore prohibited. With regard to a courtyard that was breached into the public domain, and the breach was more than ten cubits wide, so that it cannot be considered an entrance, one who carries an object from inside the courtyard into the private domain, or from the private domain into it, is liable, as it ceases to be a private domain and is subsumed into the public domain. This is the statement of Rabbi Eliezer. And the Rabbis disagree and say: One who carries from inside the courtyard into the public domain, or from the public domain into it, is exempt, because its legal status is like that of a karmelit. Although it ceases to be a private domain, it does not become a full-fledged public domain.

גַּג גָּדוֹל סָמוּךְ לְקָטָן, הַגָּדוֹל מֻתָּר וְהַקָּטָן אָסוּר. חָצֵר גְּדוֹלָה שֶׁנִּפְרְצָה לִקְטַנָּה, גְּדוֹלָה מֻתֶּרֶת, וּקְטַנָּה אֲסוּרָה, מִפְּנֵי שֶׁהִיא כְפִתְחָהּ שֶׁל גְּדוֹלָה. חָצֵר שֶׁנִּפְרְצָה לִרְשׁוּת הָרַבִּים, הַמַּכְנִיס מִתּוֹכָהּ לִרְשׁוּת הַיָּחִיד, אוֹ מֵרְשׁוּת הַיָּחִיד לְתוֹכָהּ, חַיָּב, דִּבְרֵי רַבִּי אֱלִיעֶזֶר. וַחֲכָמִים אוֹמְרִים, מִתּוֹכָהּ לִרְשׁוּת הָרַבִּים, אוֹ מֵרְשׁוּת הָרַבִּים לְתוֹכָהּ, פָּטוּר, מִפְּנֵי שֶׁהִיא כְּכַרְמְלִית: