Chapter 681 Guests from the Middle East

After finishing the conversation with Tao Zhexuan, Xu Chuan put down his mobile phone and looked at the paper on the desk with a sigh of relief.

Whether Riemann's conjecture could be solved or not was in his mind.

After all, it is true that Riemann conjecture is not the most difficult problem in the mathematical world today. At least, it should be the most difficult and influential of the seven millennium problems.

Since Riemann put forward this conjecture in the middle of the 19th century, after more than 150 years, Riemann conjecture still has not made many breakthroughs, and even there are not many achievements close to it, which shows its great difficulty.

Of course, when pure conjecture exists

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