Eruvin 70b-72a
Understanding the mechanism of inheritance, and the implications for Eruvin \u2022 When may one member of a courtyard nullify his share to permit carrying in the courtyard? \u2022 When do business partnerships obviate the need for Eruvin? Do the same members of a shared courtyard and alleyway need to effect both a merger of the courtyard and a partnership in the alleyway, or may they rely on one procedure?