بسم الله الرحمن الرحيم
(Fatwa: 1133/1151/L=09/1436)
In the question mentioned above when the husband has written one talaq then one talaq took place. If the wife has experienced three menstruation cycles from the time of talaq then her iddah is over. If they want to live together then they may do so with a fresh nikah.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
