C1013 Proof Mathematics

In the warm applause, a young man stood up.

Qin Luo stopped in his tracks and turned to the young man with a smile, "Please speak."

"I am David, a professor in the mathematics department of Rhein University. I have a question for you." The young man said, "Take me for example. I am a professor in the mathematics department. Most of the problems I study are deep mathematical problems