When balcony and courtyard residents did not make a joint eruv, how is a shared mound or pillar in the courtyard allocated — and does its height and proximity to the balcony determine who may carry to it?
Synopsis
The Mechaber lays out a graduated rule based on the height of a mound or pillar and its distance from the balcony: if it is under 10 handbreadths tall it is shared and both are forbidden to carry there; if it is 10+ handbreadths high and within 4 handbreadths of the balcony the balcony residents may use it (their use is easier); if it is 4+ handbreadths away from the balcony despite being 10+ handbreadths high, both are again forbidden. Rema adds a clarifying condition about proximity to the balcony.
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When balcony residents descend via a ladder into a shared courtyard and exit to the public domain, do they restrict the courtyard residents from carrying if they did not make a joint eruv?
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When there is a dispute about whether a mound or pillar within 10 handbreadths of the balcony (but more than 10 handbreadths below the balcony) is shared or belongs to one side, what is the ruling?
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If one of the parties (courtyard or balcony) owns the mound or pillar exclusively (not shared), do they restrict the other party?
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If a platform (matzevah) of at least 4 handbreadths wide is placed in front of the balcony opening, does the balcony restrict the courtyard residents?
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How are projections (zizim) extending from the walls of a courtyard allocated between upper-story residents and courtyard residents when they have not made a joint eruv?
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If the balcony is within 10 handbreadths of the courtyard floor but a partition of 4 handbreadths has been erected around it, can the courtyard and balcony make separate eruvim?
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When the Biur Halacha clarifies the mound/pillar case, is there a minimum width requirement for the mound or pillar before the mutual-restriction rules apply?
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