Institute of Physics.
Luo Wenxuan and Lu Zhou were standing side by side in front of a blackboard in the director's office. They looked at the lines of equations on the blackboard and stood there silently for a long time.
Five minutes went by.
Luo Wenxuan suddenly broke the silence.
"I'll get us something to drink?"
"Alcohol?"
"Yeah, it's my habit. Whenever I can't solve a problem, I'll find something to drink"
"Then take a nap on the couch? Just throw the troublesome things aside?"
"Don't say that… Do you really think I'm someone who does that?" Luo Wenxuan rubbed his nose and looked at the blackboard. He said, "Okay then, drinking aside, I suddenly remembered something."
Lu Zhou: "What?"
"A thesis in Annual Mathematics, published in 1974… I don't remember which page, but Witten showed it to me." Luo Wenxuan recalled for a moment and said, "It mentioned a possible way."