Is it valid not to repeat the prayer if the imam omits the recitation after rising from the prostration of recitation and bows directly, and is it true that reciting Al-Fatiha, according to the Hanafis, is one of the obligatory acts of prayer that necessitates prostration of forgetfulness if omitted?

Summary of the answer: According to the Hanafis, reciting Al-Fatiha in prayer is obligatory in the first two rak'ahs and sunnah in the last two. Intentionally omitting the recitation of a surah after Al-Fatiha in the first two rak'ahs incurs sin, while omitting it forgetfully necessitates prostration of forgetfulness (sujud al-sahw).

According to the majority of scholars, reciting Al-Fatiha is a pillar (rukn) in every rak'ah, and reciting a surah after it is a recommended sunnah. Whoever omits it, their prayer is valid, and nothing is due from them.

Therefore, if the Imam prostrates for recitation after reciting Al-Fatiha and what was easy from the Qur'an, then stands up and bows without reciting anything after the prostration of recitation, his prayer is valid, and he is not required to perform prostration of forgetfulness, neither according to the majority of scholars nor according to the Hanafis, who hold that recitation after the prostration is commendable, not obligatory.