If one forgot to set up an eruv before Yom Tov (which falls on Thursday and Friday before Shabbat), may one set up a conditional eruv on the first day of Yom Tov?

ShabbatEruvEruv Chatzerot

Synopsis

When Yom Tov falls on Thursday-Friday and one forgot to set up an eruv, one may set up a conditional (al tenai) eruv on the first day of Yom Tov, with specific verbal formulas on each day.

Rishonim
Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

Discussion

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