Nedarim

We learnt: R. ELIEZER ARGUED, IF HE CAN ANNUL THE VOWS OF A WOMAN WHOM HE ACQUIRED HIMSELF, SURELY HE CAN ANNUL THOSE OF A WOMAN GIVEN TO HIM BY GOD! But if it means that he made her a declaration, it is [also] a case of acquiring her himself? — It means that he acquired her himself through the instrumentality of Heaven. You may [now] solve Rabbah's problem? [Viz.,] in the view of Beth Shammai, does a declaration effect erusin or nissu'in?  You can solve it that it effects nissu'in; for if it effects erusin, surely we learnt, [In the case of] a betrothed maiden, her father and [betrothed] husband [jointly] annul her vows?  Said R. Nahman b. Isaac: What is meant by 'He can annul [her vows]'? He can annul [them] in conjunction with her father. It was taught likewise as R. Ammi: If a woman waits for a yabam, whether for one or for two, — R. Eliezer ruled: he can annul [her vows]; R. Joshua said: [Only if she waits] for one, but not for two; R. Akiba said, Neither for one nor for two. R. Eliezer argued: If a woman, in whom he has no portion at all until she comes under his authority [by marriage], yet once she comes under his authority, she is completely his;  then a woman in whom he has a portion even before she comes under his authority,  when she does come under his authority, she is surely completely his! Said R. Akiba, No. If you say this in the case of a woman whom he acquires himself, that is because just as he has no portion in her [before marriage], so have others no portion in her; will you say [the same] of a woman gifted to him by God, in whom, just as he has a portion, so have others too a portion in her! Thereupon R. Joshua said to him: Akiba, your words apply to two yebamim: what will you answer in respect of one yabam? He replied: Have we then drawn a distinction [in other respects] between one yabam and two yebamim, whether he makes her a declaration or not? and just as it is in reference to other matters, so it is in reference to vows.  Thus did Ben 'Azzai lament, 'Woe to thee, Ben 'Azzai, that thou didst not study under R. Akiba.'  How