HISTORY
1)
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Was Tish'ah b'Av observed as a fast during the time of the Second Beis Hamikdash?
TODAY
2)
Resolution or Obligation? -
Nowadays, what is the level of obligation to fast on these four fasts? What might be practical ramifications?
1. Yosef Da'as to Rosh Hashanah 18:p2, ד"ה אין til p3


