Qiao Yu looked at Lan Jie in surprise.
Because this problem was indeed very difficult, arguably the hardest equation-solving problem he had encountered since seriously studying mathematics. So when he explained it, there was a bit of a show-off intention, and he was quite detailed.
But the good guy said he didn't understand?
"Phew... As I said, I didn't put much effort into algebraic geometry and number theory in university. If it's just basic stuff, it's fine, it's only the content I learned during my undergraduate. The deeper number theory... In my master's degree, I focused on combinatorial mathematics, which is the study of the combinatorial properties of discrete structures like permutations, combinations, graphs, sets, sequences, that kind of stuff...
