Is an eruv valid when placed for a conditional contingency (e.g., 'if the scholar comes from the east, my eruv is eastward') even if the scholar was outside the 4,000-amah range at twilight?

When making an eruv techumin for many people from one's own food, how much food must be provided?

5 opinions

When the eruv-maker did not inform a potential beneficiary before Shabbat, can that person rely on the eruv after nightfall?

3 opinions

If a person was informed of the eruv before Shabbat but did not consciously decide to rely on it until after nightfall, is the eruv valid for them?

4 opinions

If one placed an eruv for all Shabbatot of the year with the condition 'whichever one I choose I will rely on,' but did not decide until Shabbat morning, is the eruv valid?

4 opinions

Is notification required for an eruv techumin made for others, and why?

2 opinions

What is the legal basis allowing all the conditional eruv scenarios in Siman 413?

4 opinions

Must the eruv-maker transfer ownership (zikui) to beneficiaries through a third party when making an eruv for many from his own food?

3 opinions

Is a food quantity less than two meals for every single person of the town valid if only some people will rely on the eruv?

2 opinions