Is a city eruv required to encompass all alleys, or can individual alleys make separate eruvin independent of the city-wide eruv?
Synopsis
Individual alleys may always form their own separate eruvin; the city-wide eruv is one option, not a requirement. The Mechaber explicitly states that alley-by-alley eruvin are even more effective than the city-wide shiur arrangement.
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Can a city that was originally private property (owned by one individual) be included in a single city-wide eruv without any exclusion?
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Does a publicly-owned city with two entrances (through which the public enters one and exits the other) require an exclusion (shiur) for a valid city eruv, even if it later became private property?
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Can non-Jewish houses count as the required exclusion (shiur) for a city eruv?
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Does a ladder (on the city wall) on one side count as a 'second entrance' that would require a shiur for a city eruv?
3 opinions
Does a garbage heap (ashpah) in front of one of a city's two entrances render that entrance legally non-existent, so that the city can have a single eruv without a shiur?
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