Generally speaking, someone doing theoretical research was doing one of two things.
They were either reading the relevant literature or working on their thesis.
Even at Lu Zhou's level, he was still tied by this rule. Every day, aside from his miscellaneous work, he would either read theses from the top 3 journals or quietly sit at his desk and think about his own problems.
After the "Control of Earth and Moon" mission chain finished, he planned on returning to mathematics research and reach level 10 in mathematics. Lu Zhou used a keyword software to search for relevant mathematics literature.
Lu Zhou would find and carefully read any theses regarding the Riemann hypothesis or the Riemann function, as long as they were in the top 5 journals.
Even though he knew it was unrealistic for someone in this field to create outstanding research results, he still wanted to get a little inspiration from other people's work.