When three courtyards open into one another and the middle placed its eruv in each outer courtyard separately (in two different houses), versus placing both outer courtyards' eruvin in one house in the middle courtyard — does this affect whether the outer courtyards are permitted with each other?

When three courtyards open into one another and to a public domain, and each outer courtyard made an eruv with the middle one but the outer ones did not make an eruv with each other — are the outer courtyards permitted to carry between themselves?

3 opinions

When two courtyards are one inside the other (inner opens only to outer, outer opens to alleyway), each makes its own eruv, and one resident of the outer courtyard forgets to contribute to the eruv — is the inner courtyard affected?

3 opinions

When two nested courtyards each make their own eruv and one person from the inner courtyard forgets to contribute — are both courtyards forbidden?

3 opinions

When two nested courtyards make a joint eruv placed in the outer courtyard, and one resident (from either courtyard) forgets — are both forbidden?

4 opinions

When a single individual lives in the inner of two nested courtyards and two (or more) residents of the outer courtyard made an eruv among themselves — does the individual in the inner courtyard restrict the outer courtyard?

4 opinions

In three courtyards one inside the other, each with a single individual, and many have foot traffic through the outer — do the inner individuals restrict the outer courtyard?

3 opinions

In three nested courtyards, if two residents in the innermost courtyard fail to make an eruv — do they restrict the middle and outer courtyards?

3 opinions

What is the general principle governing when a foot that uses one courtyard on the way to another restricts or does not restrict that courtyard?

4 opinions