DY. I think R” Belsky’s view on the Eruv is a bit extreme, and not the mainstream.
In your view can I as talmid of R” Menash Klien/’ Yechezkel Roth carry in BP?
(This doesnt have to turn into a discussion about the Eruv in of itself, which to be clear, I do not actually use)
Now granted R’ Belsky would say absolutely not, in which case it would certainly be mesayeah to lend a book on shabbos.
“Can you point to the siman which says it’s muttar?”
You dont need a siman to say it is mutar, there is no siman that says driving a car is mutar it is mutar becasue it isnt assur. Unless ty is Shabbos in which case it is assur becasue…