Responsa for Bava Batra 50:11
<big><strong>מתני׳</strong></big> מרחיקין את האילן מן הבור עשרים וחמש אמה ובחרוב ובשקמה חמשים אמה בין מלמעלה בין מן הצד אם הבור קדמה קוצץ ונותן דמים ואם אילן קדם לא יקוץ ספק זה קדם וספק זה קדם לא יקוץ ר' יוסי אומר אע"פ שהבור קודמת לאילן לא יקוץ שזה חופר בתוך שלו וזה נוטע בתוך שלו:
R. Joshua b. Levi, however, said that he should always turn to the south, because through obtaining wisdom he will obtain wealth, as it says. length of days are in her [wisdom's] right hand, in her left hand are riches and honour.<span class="x" onmousemove="('comment',' Prov. III, 16. ');"><sup>18</sup></span> But was it not R. Joshuah b. Levi who said that the <i>Shechinah</i> is in the west? — [He means that] one should turn partly to the south. Said R. Hanina to R. Ashi: Those like you who live to the north of Eretz Yisrael<span class="x" onmousemove="('comment',' R. Ashi was in Babylonia. ');"><sup>19</sup></span>
Teshuvot Maharam
A. Those parts of the beams which extended into A's portion belonged to him exclusively, and he had a right to cut them off, especially since the intervening wall belonged to him. Although the act of sawing and chopping weakened B's and C's structures, since the extension of the beams into A's room served no useful purpose to B and C, and because of their unnecessary weight were even detrimental, A had a right to cut them off. In any event, B and C are not entitled to any compensation for their loss, now that the act has been done.
SOURCES: Am II, 198.