Reference for Yevamot 29:11
ואיבעית אימא כנס ולבסוף גירש איכא בינייהו
married [the rival] first and subsequently divorced [his wife].<span class="x" onmousemove="('comment',' V. supra 13a. Such as was the case with R. Gamaliel's daughter. The first Tanna is of the opinion that the rival was permitted to R. Gamaliel because at the time his brother died she was no more his daughter's rival. The 'Others', however, maintain that so long as the two were rivals for any length of time (in this case, between the time of the marriage with the rival and the divorce of R. Gamaliel's daughter) they remain legally as rivals for all time, and the only reason why R. Gamaliel was allowed to marry the rival of his daughter was because his daughter had the defect of being incapable of procreation, and the rival of such a woman is permitted to the brothers. V. supra 2b. ');"><sup>29</sup></span> And if you wish I might say that the difference between them<span class="x" onmousemove="('comment',' The 'Others' and the first Tanna. ');"><sup>24</sup></span> is whether a stipulation<span class="x" onmousemove="('comment',' That the woman, e.g., suffers from no illness or that she is not afflicted with any infirmity. ');"><sup>30</sup></span>