For the source text click/tap here: Nedarim 45
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If two people jointly owned a courtyard - which was a very common situation - and then they had a falling out, so that each prohibited to himself, by a vow, to benefit from his fellow's property, they have a problem entering their own courtyard. Since the courtyard is not divided, then each portion of it is jointly owned by both of them. Thus, when one treads on the ground, he is partially transgressing the property of his fellow, which is prohibited to him by a vow.
However, Rabbi Elazar ben Yakov says that each one, when he enters the courtyard, enters his own property. When people buy property in common, they divide the ownership of it for use, by area and in time. Exactly which portion and at what time belongs to each is determined by the future event of him entering it.
We continue our exploration of when partners split up and the way the Talmud suggests constructive ways to disagree in business partnerships.