The phone call ended.
Within 20 minutes, Lu Zhou heard knocking sounds from his front door.
Lu Zhou came out of the toilet and went downstairs.
He then saw Professor Fefferman who was breathing heavily at his front steps.
Upon seeing him, Fefferman immediately asked, "You really, really solved it? The Navier–Stokes equation?"
Lu Zhou looked at Professor Fefferman, who was gasping.
"… Do you want to catch your breath first?"
"No, it's fine." Fefferman leaned against the door with his hand and said, "Tell me, how did you do it?"
Fefferman was usually gentle and easy-going; he had never been this serious before.
Lu Zhou could tell Fefferman was craving for an answer.
"… Long story, come with me."
Lu Zhou turned around and walked upstairs.
Lu Zhou brought Professor Fefferman to the second floor, and they went into his study room. He cleaned up his messy table and floor before he pulled out a one-hundred-page manuscript. He handed the manuscript to Professor Fefferman.
