Lu Wenan actually knew that Yang Hui was on a private visit to Weifu, but he did not obstruct it. In order to prevent the leakage of espionage and technology of the Mongolian army, the Perak Army attaches great importance to the construction of an intelligence system, and the military and civilians also maintain a high degree of vigilance against strangers. After a few days of private visits to Chongqing Mansion City and its surroundings, Yang Hui did not get the results he wanted, so he asked Lu Wen'an for a few horses and a team of escort soldiers, preparing to go to the surrounding states and counties to find out, and these were all agreed. Although the territory of the Perak Army is safe and there are no bandits and bandits, this is a time of war after all. When Yang Hui and others were officials in Lin'an, they had to take guards with them when they went out of the city on official business.

When Ouyang Xuan listened to Lu Wen'an's report, he learned that the official from Lin'an was called Yang Hui, and he didn't care about it at first, but in the next few days, he felt more and more familiar with this name, so he asked someone to send detailed information. As early as when Yang Hui and others set off from Lin'an, Li Kaipeng sent someone to send back a secret letter, which gave a detailed account of the officials who came to Sichuan to implement the planning law. Ouyang Xuan hurriedly glanced at it, but because he was busy with affairs, he didn't pay attention to it. At that moment, he took it and looked at it carefully, and after reading it, he laughed, and Yang Bangxian and Xia Xiaogen were confused. Ouyang Xuan didn't explain, and immediately ordered someone to find Lu Wenan and ask him to arrange to meet Yang Hui. Lu Wen'an explained that Yang Hui had already taken people to Qiongzhou and other places for a private visit, and Ouyang Xuan had no choice but to give up and order Yang Hui to bring him to see him as soon as he returned.

Because he had never seen Ouyang Xuan so attentive to the officials of the imperial court, Yang Bangxian asked why. Ouyang Xuan saw the gossip on his brother-in-law's face, so he said that Yang Hui was a very useful talent for the Thunderbolt Army, and he needed to stay in Chongqing Mansion to serve the Thunderbolt Army. As a traverser, Ouyang Xuan certainly knew Yang Hui, and Li Ye, Qin Jiushao, and Zhu Shijie were known as the four masters of Song and Yuan mathematics. He left a large number of works in his lifetime, among which the famous mathematics books have a total of five kinds and 21 volumes, namely: "Detailed Explanation of Nine Chapters of Algorithm", "Daily Algorithm", "Multiplication and Division", "Multiplication and Division", "Multiplication and Division", "Continuation of the Ancient Extraction Algorithm", and later generations generally call his achievements "Yang Hui Algorithm". Historically, Yang Hui also attached great importance to the popularization and development of mathematics education, and in the "Algorithm Adaptation Fundamentals", Yang Hui formulated the "Mathematics Outline" for beginners, which is an important document in the history of Chinese mathematics education.

Mathematics is the foundation of all natural sciences, and its importance cannot be overstated. If the scientific and technological system of the Perak Army wants to reach new heights, it is absolutely inseparable from high-end mathematical talents, and although high-end mathematical talents rely on training, they rely more on talent. Although Yang Hui is not famous at the moment, he believes that under the catalysis of Ouyang Xuan's modern science and technology concept, he will definitely be able to make achievements far beyond the times. More importantly, Yang Hui is an honest and honest official, which is highly consistent with the political philosophy of the Perak Army. The other three mathematicians, Zhu Shijie had already worked for Kublai Khan's Yuan court, Li Ye was not yet an adult, and Qin Jiushao had made great achievements and researched and written the "Nine Chapters of the Book of Numbers", but his character was unbearable, and he was a disloyal, unfilial and incorruptible person. He was keen on fame and fortune all his life, not to mention, but also ran rampant in the township, bullied the side, and even killed his own son.

At this time, Yang Hui was on the way to Pujiang County, and the team guarding them was far behind, which was what Yang Hui requested, for fear of interfering with their conversation with the people. The non-stop running around for the past few days not only did not make him feel tired, but made him more and more excited. Although there was no work after a private visit, he was deeply touched. Everywhere they went, the peasants and fishermen were busy, and the peddlers and pawns performed their duties, and it was a scene of harmony and tranquility. When asked about the comments of local officials, the people praised them one after another. The answer was surprisingly consistent, which made Yang Hui and his party quite suspicious, but they asked randomly for a few days, and the people replied with a calm and sincere attitude, which did not seem to be a fraud at all, and a few people believed that the officials of the Perak Army were really honest and honest, and the high-level officials, including Ouyang Xuan, did not receive the money, nor did they have a large area of fertile land and high-rise houses.

It's just that Yang Hui doesn't believe that the Thunderbolt Army can achieve the unity of officers and soldiers, and the unity of the army and the people. The top brass of the Perak Army may have deliberately narrowed the distance between them and the people by eating and eating with the people in a show for political purposes, but they did not believe that they should be able to eat and clothe with the people for a long time, which is also the reason for the indignation of the officials accompanying them. In their opinion, Lu Wen'an's use of coarse tea and light rice to entertain them was actually an expression of dissatisfaction with the planning law. In the past half a month since he arrived at Chongqing Mansion, he has found out that the officials of the Perak Army also have two meals a day like the common people, breakfast is generally at three poles in the sun, and dinner is at dusk, and if they do not go out, they will eat in the back room of the yamen. In order to expose the lies of the Thunderbolt Army, Yang Hui picked a breakfast time and went straight to the back room of the Pujiang County Ya. Their sudden intrusion surprised more than a dozen people who were eating in the back room, and they all looked up at these uninvited guests.

Yang Hui and the others could see clearly that on the two simple wooden tables, each person had a large pottery bowl in front of him, the bowl was filled with rice porridge, a basket of wheat cakes was placed in the middle of the wooden table, and two bowls of green vegetables and taro and a plate of pickles were also placed. It is said that although this food is good, it is even comparable to the life of a well-off home in Lin'an, but it is no different from the food of the people of Pujiang, much worse than the meal that Lu Wen'an received them, and even worse than the meal of the Southern Song Dynasty officials outside the Thunderbolt Army. Seeing a few people staring at the wooden table of food, one of them, a middle-aged man dressed as a farmer, ordered people to give up their seats, and asked who they were and what they meant. At this time, the captain of the escort had followed in and introduced the personnel of both sides. It turned out that this middle-aged man was Yang San of Pujiang County, he was originally a destitute person in Dayi County, because of the invention of the "Yang San Work Method" in the reclamation of the rootless mountain, which greatly improved the efficiency of land reclamation and was promoted, he was the person in charge of Anren County, and now he became the county governor of Pujiang because of his outstanding political achievements. The rest of the diners were all subordinates and messengers of the county government.

After making an unannounced visit to Pujiang, Yang Hui went to Baizhang, Yizheng and other cities and a number of reclamation points, and saw the same situation as what Chongqing Mansion and Pujiang saw. At this moment, the captain of the escort had received a notice from Lu Wen'an and took them to visit several garrison camps and the garrison of the basic militia. Ouyang Xuan had already made up his mind to recruit Yang Hui, so he ordered them to be allowed to enter these sensitive locations. In the battalion, Yang Hui saw not only soldiers with strict military discipline, bright armor and full of spirit, but also polished artillery, muskets, knives and spears and other weapons. These Lin'an officials were also knowledgeable people, and although they had not seen the power of firearms with their own eyes, they also knew that they must be amazing, otherwise the Thunderbolt Army would not have spent so much fine iron casting, let alone painstakingly maintained them.

After this private visit, Yang Hui and his party felt that the trip was over, and the imperial court's plan was useless in the Perak Army, although they had not seen the income and expenditure books of the Perak Army, and they had not even figured out the source of the Perak Army's finances and taxes. But what they saw and heard told them that it was impossible for the Thunderbolts to eat empty pay and drink the blood of their soldiers. After all, soldiers' salaries and living expenses must be regularly publicized by the company and supervised by the soldiers. They are convinced that under the example of Ouyang Xuan and a group of high-level officials, only honest officials are allowed to exist under the current Thunderbolt system.