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If a Ketanah does Mi'un while she is being brought to the Chupah, the Mi'un is valid. (1)
Rebbi Yehudah ben Beseira: If a Ketanah accepts Kidushin or marries someone else, it is regarded as Mi'un. (2)
Rebbi Eliezer: The husband of a Ketanah is not entitled to her Metzi'os or handiwork; he cannot annul her vows and he does not inherit her. (3)
Shmuel: If the Ketanah receives a marriage proposition and turns it down because the suitor is not appropriate, it is regarded as Mi'un.
When a Ketanah does Mi'un, she and her former husband are permitted to marry the relatives of each other.
If the husband gives a Get to a Ketanah, they are prohibited to marry the relatives of each other.
If the husband gives a Get to the Ketanah, they remarry, and then she does Mi'un, they are permitted to the relatives of each other. (4)
If a Ketanah does Mi'un, marries someone else, gets divorced, marries a third time, and then does Mi'un again, she is permitted to return to her first husband. (5)
Ula says that once a Ketanah is divorced three times, she may not return to her original husband from whom she was divorced, even after she does Mi'un. (6)
If the Yevamah was a prohibited as a Sheniyah, and, after her husband died, she married the brother from the father, the Tana'im disagree about whether she may do Mi'un in order to uproot the original marriage of the Sheniyah.
A BIT MORE
1. Even if she does Mi'un while she is serving guests or while she is retrieving an object from a storekeeper for her husband, the Mi'un is valid.
2. It is regarded as a Mi'un even if she is a Nesu'ah. However, the Chachamim maintain that it is not regarded as Mi'un.
3. If he is a Kohen, he is not allowed to become Tamei for her upon her death. Rebbi Yehoshua disagrees and says that the husband receives all of the rights of an ordinary husband.
4. If she does Mi'un and subsequently he remarries her and gives her a Get, they are prohibited to the relatives of each other.
5. However, she may not return to her second husband who divorced her, even though she did Mi'un to the third husband.
6. This is because once she receives a Get three times, she appears like a Gedolah.
MARRIAGE AS A FORM OF MI'UN
The Rambam says that the statement of Rebbi Chanina ben Antignos in the Mishnah, "If the Ketanah is not old enough to guard her Kidushin, she does not need Mi'un," does not mean that she does not need Mi'un at all. Rather, it means that if she marries someone else she does not need Mi'un. The Rashba asks that that Rebbi Yehudah ben Beseira says that if a Ketanah accepts Kidushin or marries someone else, it is regarded as Mi'un, and that applies even if she is old enough to guard her Kidushin. The Yam Shel Shlomo answers that according to Rebbi Yehudah ben Beseira, her marriage to someone else is regarded as Mi'un only b'Di'eved. L'Chatchilah, she must do Mi'un before she marries someone else. According to Rebbi Chanina ben Antignos, if she is not old enough to guard her Kidushin, she may remarry without Mi'un, even l'Chatchilah.
Everyone agrees that a Ketanah may do Mi'un even nowadays. Rav Yakov Pollack allowed a Ketanah to do Mi'un in his days, unlike those who are stringent and do not allow a Ketanah to do Mi'un nowadays.
All of the Gedolei Ashkenaz disagreed with Rav Yakov Pollack, but he nevertheless allowed the Ketanah to remarry without a Get. (Taz)
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