Is it permissible to pray Shabbat Ma'ariv early if one already prayed Minchah after Plag HaMinchah (the tartei d'satrei problem)?

ShabbatPrayerMa'ariv

Synopsis

If someone prayed Minchah after Plag HaMinchah (following the Rabbanan's view that Minchah continues past Plag), can they then pray Shabbat Ma'ariv from Plag HaMinchah (following Rabbi Yehudah's view that this is already night-time)? This creates a contradiction.

Late Acharonim
Lenient
Strict
Lesser cited
Major authority

Discussion

Discussion coming soon.

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