Does the prohibition of hachana (preparation) between Yom Tov and Shabbat apply only to speech, or also to actions done b'dieved when eruv was made with bread on day one but verbal declaration was made?
Synopsis
The Biur Halacha (citing Acharonim) addresses a nuanced scenario: when one makes a conditional eruv with bread on day one of diaspora Yom Tov with a declaration for day two — whether b'dieved this is valid.
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When Yom Tov falls adjacent to Shabbat (or for two days of Yom Tov in the diaspora), can one make two separate eruvei techumin — one for each day — in opposite directions?
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When making an eruv for both days of Yom Tov or Shabbat-Yom Tov, must the eruv be physically present at its location during both twilights?
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When acquiring eruv techumin by foot (bein hashmashot) on the second day of a Shabbat-Yom Tov combination, may one verbally declare the eruv?
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If one made the eruv with bread on day one, may he use different bread for the eruv on day two?
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If one did not make any eruv at all on day one (neither bread nor foot), may he acquire eruv by foot on day two?
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When making a two-day eruv in opposite directions, is it required that each eruv location be reachable on the first day?
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Is Yom Kippur equivalent to Shabbat regarding both eruv techumin and eruv chatzeirot?
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