What is the minimum required amount (shiur) for an eruv at the outset, and how is it calculated based on the number of participants?

When an eruv is invalidated and someone comes to fix it using the same type of food as the original, must he inform the other courtyard residents before re-making the eruv on their behalf using their food?

3 opinions

When an eruv is invalidated and someone comes to fix it using a different type of food than the original, and the original food is completely gone, must he notify the residents if he uses their food? What if he uses his own food?

4 opinions across 3 eras

When an eruv is invalidated and someone comes to fix it using a different food type, but the original food has not completely disappeared — only diminished — must he notify the residents even when using their food?

2 opinions

When new residents join the courtyard after the eruv was made, does the person remaking the eruv need to notify them, and does it matter if the new resident's house opens to one or two courtyards?

3 opinions

If the eruv is reduced below the minimum required amount after the first Shabbat has begun, is the eruv still valid for subsequent Shabbatot?

5 opinions

If the eruv bread becomes moldy and unfit to eat, must the eruv be remade?

5 opinions