He did not write the equations of motion first. He wrote what Bukhovtsev had taught him: a single sentence at the top of the board.
And on the first page of every copy, under his name, he wrote the old motto: bukhovtsev physics
Dmitri’s hands shook. The man was dead. The letter was thirty years old. It had been lost in a file drawer, found by a librarian, forwarded by a ghost. But the physics was alive. It had traveled through time to correct him. He did not write the equations of motion first