The principle of pi tikra yored v'sotem- the edge of a roof can conceptually descend and form a wall, analysis of when this is applied and discussion of modern day overpass bridges being used as part of city eruvin
The principle of pi tikra yored v'sotem- the edge of a roof can conceptually descend and form a wall, analysis of when this is applied and discussion of modern day overpass bridges being used as part of city eruvin