Rushi is reading a PDF textbook on his computer.
“Joe, do you have a physical copy of this?”
I glance at the page of text on the screen, reach over to the heap of junk piled on top of the coffee table, carefully rummage around for a moment, and pull out the book in question. He doesn’t need to tell me what book he’s reading: it haunts my dreams still
Of course, last quarter when I was in the undergrad algorithms course, I borrowed his copy of the Kleinberg, Tardos book
Or, if you don’t coordinate well enough, you collectively end up with n copies of each textbook…