Zhang Zong invited Gong Ren, a Tubo man, to enter the living room, and Wan'er also brought tea. It was not until this time that Gong Ren said, "Sir Zhang, although he is far away in Tubo, he bought a semiotic mathematics book from the Han merchants last year. He was also fascinated by Zhang Xueshou's talent. This time, he was lucky enough to come with the delegation, so he took the liberty to visit. I hope that Mr. Zhang will not blame him!"

Zhang Zong was very surprised when he learned that the other party actually came from semiotic math. He had to know that although he had passed on semiotic math and even compiled it into a book, he was mainly used on a small scale. Of course, some merchants discovered its value and started to be used in business. However, the influence was only within the Tang Dynasty. However, Gong Ren, who was far away in Tubo, had noticed the value of semiotic math.

"I didn't expect that Brother Gong, you are also interested in mathematics. I believe you must have a deep understanding of mathematics!" Zhang Zong smiled and praised a few times, and then discussed several math issues with the other party. As a result, Gong Ren was indeed answering questions smoothly, which made Zhang Zong believe that the other party had indeed made some hard work in mathematics.

Gong Ren was very interested in mathematics, and at this time he also took out the problems he had encountered before and asked Zhang Zong for advice. Zhang Zong also answered them one by one. Whenever he solved a problem, Gong Ren would happily scratch his head and look happy.

Zhang Zong became more and more surprised. At first, he suspected that Gong Ren suddenly came to visit him, and he might have ulterior motives. However, now it seems that he may have just been learned by mathematics. For most ordinary people, mathematics is actually very boring, and only those who really like it will study it, and this kind of love is absolutely impossible to pretend.

Zhang Zong and Gong Ren are becoming more and more speculative as they talk. Although they are actually in a hostile relationship from the perspective of countries, this pure academic exchange makes the two feel that they meet too late. In particular, Zhang Zong found that Gong Ren is extremely smart. Even if his foundation was a little shallow, as long as he gave him a thorough understanding, he could immediately get one and three.

However, it was getting late at this time. Gong Ren also looked up and looked out the window, then said goodbye to Zhang Zong with regret, "I have benefited a lot from listening to Mr. Zhang's explanation today. It's a pity that it's getting late, so I won't bother Mr. Zhang!"

"Brother Gong is polite. Let's verify each other and learn from each other. If you are not busy in the future, come here to find me!" Zhang Zong immediately stood up and smiled.

"That's great. According to the plan, our mission may have to stay in the Tang Dynasty for about a month. I just named it in the mission. There is nothing wrong. I can come to Mr. Zhang to ask questions every day in the future." Gong Ren also showed an ecstatic expression when he heard this.

"No problem. In addition, I have to go to Chongxian Pavilion to teach every few days. If you are interested, you can also listen together. I believe that Your Highness the Crown Prince will definitely not refuse!" Zhang Zong smiled again. The Tang Dynasty was still very open in academic aspects. There were tens of thousands of students sent by various countries in Guangzhong in Chang'an City, and many of them could even study in the Imperial College.

"Chongxian Pavilion! I have heard of Daming for a long time, but can I really go there?" Gong Ren couldn't help but say excitedly again when he heard Zhang Zong's words.

"Of course there is no problem. In fact, Chongxian Pavilion is in Furong Garden. When you go to see the prince today, you should have passed by the Chongxian Pavilion, but you may not have noticed it." Zhang Zong smiled again.

Chongxian Pavilion is actually not as strict as others imagined. If it weren’t for the royal relatives like Li Dan and Li Guangshun, there would be no guards in the museum, and anyone who could enter Furong Garden could enter. After all, Chongxian Pavilion is essentially just an educational institution. Except for the important library, there would be no value in other places.

After hearing this, Gong Ren also thanked Zhang Zong again and agreed to ask for advice tomorrow. Zhang Zong didn't have any classes tomorrow, so he agreed happily. In the end, he personally sent Gong Ren away.

However, after seeing Gong Ren leave, Zhang Zong closed the door and turned around, his brows frowned at this time. Gong Ren should have no problem, and his identity is also public, so it should be easy to find out from the Tubo delegation, so Zhang Zong agreed to take him to Chongxian Hall.

However, Zhang Zong was considering another thing at this time. Although Gong Ren's purpose was simple, the family behind him was the first Tubo nobleman, and he could even confront the Tubo royal family. Especially he knew clearly that Gong Ren's family would be liquidated by the Tubo royal family in the future, which was his greatest convenience and reliance.

"Since you know that Gong Ren's family and the Tubo royal family will break apart sooner or later, can you do something about this?" Zhang Zong whispered to himself at this time.

Tubo was the most powerful enemy in the middle of the Tang Dynasty, especially posed a huge threat to the Western Regions of the Tang Dynasty. This also restricted the Tang Dynasty's considerable military strength and consumed countless finances. If this threat could be resolved, the Tang Dynasty would have more power to deal with other enemies, such as the Silla in Liaodong and the grasslands who were ready to move.

"What are you thinking about?" At this moment, Wan'er suddenly walked in with supper. Seeing Zhang Zong's thoughtful look, she couldn't help but ask.

"This..." Zhang Zong hesitated for a moment, then said, "Wan'er, I have a question and want to hear your opinions."

"Is it about that Tubo?" Wan'er's seven orifices were erect, and she guessed what Zhang Zong was going to say in an instant.

"Yes, the Tubo man just now was named Gong Ren, who was the grandson of the famous Lu Dongzan. His father was Lun Qinling, who defeated the veteran general Xue Rengui. Although this man was of noble origin, he was obsessed with mathematics and did not show any other thoughts for the time being, but I think he could use him to do something about Tubo!" Zhang Zong said his thoughts, and he had nothing to hide from Wan'er.

"Lu Dongzan, on Qinling, it turns out that's it. No wonder this Tubo people are very polite and not as rude as other Tubo people." Wan'er smiled again when she heard Gong Ren's origin, but then she shook her head and said, "But it's a pity, why does this Gong Ren's family look so much like the Changsun family?"
Chapter completed!