Nedarim, Chapter Ten, Mishnah 2. In the previous Mishnah we learned that a betrothed maiden - a girl between the ages of twelve and twelve and a half whose betrothal to a man has taken place - has her vows annulled by her father and her husband together, and from that moment on the vow no longer takes effect.
If the father died:
"Mes ha'av - lo nisroknah reshus la'ba'al" - the authority to annul the vows does not pass into the husband's hands alone. Until now the annulment of both of them together was required in order to nullify the vow, and now, when there is no longer a father, the husband has no power to annul on his own.
If the husband died:
"Mes ha'ba'al - nisroknah reshus la'av" - the power passes to the father exclusively, and he can annul her vows on his own, unlike the law regarding the husband.
"Bazeh yafeh koach ha'av mi'koach ha'ba'al":
In this matter, as explained, the father's power is greater than the husband's: the father annuls even when he is alone and there is no husband, whereas the husband cannot annul without the father.
"U've'davar acher yafeh koach ha'ba'al mi'koach ha'av":
"She'ha'ba'al meifer be'vogeres" - once the six months of na'arus have passed and she has become a bogeres, the husband still has the power to annul her vows, and so too throughout all the days of their marriage.
"Ve'ha'av eino meifer be'vogeres" - once she has become a bogeres, the father's power to annul her vows lapses, whether she is married to her husband or not married to him. Only while she is still a na'arah does he have this ability.
In summary: in this Mishnah we learned two respects in which the father's power differs from the husband's: when the father dies the authority does not pass to the husband and he cannot annul on his own, whereas when the husband dies the authority passes to the father and he annuls on his own - in this the father's power is greater; and conversely, the husband annuls for a bogeres while the father does not annul for a bogeres - in this the husband's power is greater.