Responsa for Bava Batra 71:10
אמר רבא אם היה קטן מוטל בעריסה יש לו חזקה לאלתר פשיטא לא צריכא דאית ליה אימא מהו דתימא ניחוש דלמא אימיה עיילתיה להתם קמ"ל אימא לא מנשיא ברא
Raba further said: If the slave is an infant in a cradle, presumptive right to it is conferred immediately.<span class="x" onmousemove="('comment',' Because the child could not have got into the house by itself; hence the presumption is that it was bought from the previous owner. ');"><sup>18</sup></span> Surely this is self-evident? — It required to be stated on account of the case where the child has a mother. You might think in that case that there is a chance that the mother brought it into the house where It now is [and left it there]. [Raba therefore] tells us that a mother does not forget her child.
Teshuvot Maharam
A. In city property digging is not considered a valid act of possession. Likewise A did not acquire any rights to window lights since a Gentile does not renounce his rights to his property before he receives the money, and the Gentile's property was, therefore, not (res nullis) ownerless. However, before paying money to the Gentile, let B perform a valid act of possession (such as locking a door, fixing or breaking part of the fence, etc.); otherwise A will acquire rights to window lights during the interval between the paying of the money and B's taking formal possession, since during such interval the Gentile's property will be res nullis.
SOURCES: Cr. 63–64; Pr. 28–29; L. 338; Mord. ibid.
Teshuvot Maharam
A. The removal of the ban against settlement by waiver is accepted by the communities as legally binding, although, in talmudic law, rights in real property cannot be waived or relinquished unless the waiver be accompanied by a formal act of possession. But since the community denies A's claim, A must produce proof that the ban against settlement had been waived in his favor. A community is in complete possession of its rights and does not have to protest any encroachments on such rights. Therefore one can not claim usucapion as a factor in obtaining possession of community rights. This law is accepted throughout this Kingdom.
SOURCES: Pr. 46; L. 351; Mordecai Hagadol, p. 308a.
Maharach Or Zarua Responsa
Teshuvot Maharam
A. The removal of the ban against settlement by waiver is accepted by the communities as legally binding, although, in talmudic law, rights in real property cannot be waived or relinquished unless the waiver be accompanied by a formal act of possession. But since the community denies A's claim, A must produce proof that the ban against settlement had been waived in his favor. A community is in complete possession of its rights and does not have to protest any encroachments on such rights. Therefore one can not claim usucapion as a factor in obtaining possession of community rights. This law is accepted throughout this Kingdom.
SOURCES: Pr. 46; L. 351; Mordecai Hagadol, p. 308a.
Teshuvot Maharam
A. A's wife had no right to promise a dowry or give anything to B or C without A's permission. Her promises and gifts were, therefore, void and B must return to A the valuables A's wife had deposited with him.
SOURCES: Pr. 858.