Just as he was pondering another difficult point, the phone suddenly rang.
Seeing Daniel's name displayed on the screen, Robert Stephen eventually answered the call, showing respect.
"Hi, Robert, did you look at the problem I sent you in the email?"
"Hmm? I haven't checked my emails today."
"Oh, if you're still researching Super Helical Space Algebra, I suggest you take a look now. I sent you a set of problems on Super Helical Space Algebra that the Institute for Advanced Study specially designed, you can try to solve them."
"Thank you, Daniel."
"Don't mention it, just remember to buy me a drink next time you're in Princeton. By the way, if you can't solve them, you can contact Edward and ask him for the answers... Sixty percent of the problems in this set were proposed by him, but he doesn't plan to publish the answers yet."
"Got it, thanks again."
...
After hanging up the phone, Robert immediately opened his email.
