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?

ShabbatEruvin

Synopsis

The Biur Halacha clarifies that the mound or pillar in question must be at least 4 handbreadths wide. If it is narrower, it constitutes a mekom patur and is legally nullified to each adjacent domain — mutual restriction cannot arise.

Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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