An enclosed garden larger than beit satayim (5000 sq. cubits) — can you carry throughout it on Shabbat?
Enclosures not built for dwelling have size limits. Over 5000 square cubits = carrying restricted to 4 cubits, even though it's fully enclosed.
Question 2
What is the principle of lavud?
Lavud: a gap under 3 handbreadths is treated as if it doesn't exist — the space is considered solid. This is fundamental to eruv construction.
Question 3
What is a tzurat hapetach (frame of an entrance)?
Tzurat hapetach: the minimum structure that counts as a doorway. Two uprights + one crossbeam. This is the backbone of modern eruv construction around entire neighborhoods.
Question 4
Can people standing close together serve as a partition on Shabbat?
A human partition is valid! People standing within 3 handbreadths of each other form a halachic wall (through lavud). It can even be erected on Shabbat itself.
Question 5
For a partition to be valid, what must be true about its solid vs. open portions?
A valid partition must have more solid than open space. If the open portions exceed the solid — it's not considered a partition at all.