I found that between 3 o'clock and 4 o'clock, the old man said nothing.
Hidden numbers. According to the query douban reading network. The novel "Hidden Numbers" is about a mathematician who finds a number between 3 and 4, but is not believed. He was locked up as a madman in a mental hospital, and the post-psychologist mathematician told him not to talk. Hidden Numbers is a short story written by Igerto. The main content of the story is that a psychiatrist is entrusted to treat the paranoia of a world-famous mathematician.