Bais Dov Yosef

I have a question about the use of the elevator [...]

Can one visit a friend on Shabbat during the Nine [...]

If the above is permitted, can it be done as [...]

The Gemoro makes it quite clear that a shul should [...]

Would it be a correct action for our shul to [...]

How far does one have to travel in a boat [...]

See question above. How about if someone travels by boat [...]

See question above. How about if someone is a plane [...]

If someone is a great swimmer and swims more than [...]

What is the Talmudic and Halachic source for having this [...]