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