Believe and be safe, yin to figure it, prepare and then move, do not make changes: just in the soft outside.

Seeing Du Wu shaking his head, Kong Guang also groaned: "Although I don't know what Changshi wants the old man to pay attention to what the person named Liu Xiu wants, the old man dares to guarantee that he will not be involved with the Taizhong doctor." Although Zijun is a close minister of Zai Heng, he has been doing half of his life in Confucianism, in addition, he has also dabbled in history, astronomy, calendar, etc., and recently heard that he wants to build a mausoleum for Zai Heng Governor, and has been obsessed with the law for several days, and it is said that he is about to be calculated. ”

"What is Rija Measure? Xia Guan had never heard of it. Du Wu was confused.

"Alas, the old man doesn't understand either. I heard that Zai Heng asked to make the broken dragon stone into a cylindrical shape, and cut a card slot in the upper part to embed it in the gap of the tomb door, so that the tomb door could be pressed from the inside and could not be opened from the outside. Zijun also asked the old man about this last time, saying that he wanted to calculate the transverse diameter of the cylindrical broken dragon stone, and the old man told him that the diameter was three days a week, but he said that this algorithm was outdated, and he also took out a strange thing, saying that the amount that was originally used to measure the number of grains was used to measure the transverse diameter of the broken dragon stone, which was also considered a dual-purpose. ”

Du Wu's mind was running fast, and after thinking for a while, he finally understood what Liu Xin wanted to calculate, it was pi, it was π, and Wang Mang wanted to use molten iron to pour the broken dragon stone, so he had to calculate the volume of the cylinder before he would use π.

Thinking of this, Du Wu said with a smile: "The lower official is abrupt, then Liu Xiu's name is just casually said, even if there is a person, he must not be a doctor in Taizhong." The lower official has been bothering Lord Situ for a long time, and he is uneasy, so he will leave, and the lord should go to bed early. ”

Saying goodbye to Kong Guang, Du Wu thought all the way in the carriage, should he tell Liu Xin the accurate value of the π? It's too long to remember, but 3.1415926 still remembers it clearly, in fact, Du Wu can remember the fortieth decimal place, but if it is really all made public, he may not get flowers and applause, but is more likely to be impeachment and slander. Half a step ahead is a genius, one step ahead is a madman, ten steps ahead is an immortal, if you are a hundred steps ahead, you can only die without a place to be buried. Thinking of this, Du Wu shrank his head, everyone was about to forget him recently, and he couldn't ask for trouble at this time.

But after all, I am still not angry in my heart, I know that I can help Liu Xin, I can make China's mathematics lead the world for 2,000 years, but I am also a Han person, and I help my ancestors, isn't this what it should be?

After making up his mind, Du Wu went into the study after returning home, took a charcoal pen and wrote "three feet, one inch and four points" on the slip, and handed it to Gao Liangjiang: "After you set out for the future as a teacher, you will hand over this to Liu Zijun, a doctor in Taizhong, and tell him that the exact value of the law has been calculated for the teacher, and let him use it directly." Okay, it's getting late, so you can go back first. ”

Gao Liang Jiang took the slip, nodded and just walked to the door, Du Wu said: "After the day after tomorrow, after the division goes out, there is only your master and mother in the family, and the Changshi Mansion will be closed to the guests, and you will have to explain this matter in front of Zai Heng, so as not to cause misunderstanding." In addition, during the closure of the Changshi Mansion, no outsiders will be seen, and you should not come. With that, he waved his hand and signaled that galangal could go.

When Gao Liang heard this, he was so frightened that his soul was not possessed, and he hurriedly knelt down: "The disciple collided with the master somewhere, why did he see the disciple so much?" As the saying goes, the master is like a mother, the master is not there, the second son is still in the period of filial piety, the little lady is busy with etiquette, there are only a few old and weak people in the house, the disciple can still speak in the Chu Palace, the master is on an expedition, at this time, the disciple should repay the kindness of the master's teachings, why should the disciple be pushed far away? He whimpered.

Du Wu sighed, stepped forward to help Galangal, leaned down and patted the dust on his knees, and said earnestly: "It's not for the teacher to drive you out." When you first came to apprentice, the teacher once said that he would only teach you Taoism. Now your Taoism has already been completed, and you are favored by Zai Heng. As a teacher, he is eccentric, and he has repeatedly disobeyed Zai Heng's wishes, so that you have taken care of a lot of hearts for me in vain. From today onwards, you have become a teacher, you can set up your own sect, and as a teacher, you will also recognize you Galangal as my disciple. Since then, if you have difficulties as a teacher, please take care of it and be grateful to the teacher. From now on, you can fulfill your life's ambition and save the people of the world from the sea of suffering. This Changshi Mansion, if you can't come in the future, don't come. ”

Galangal cried for a while, and seeing that Du Wu was indeed not a joke, he had to cry and kowtow to Du Wu three times, and when he got out of the Changshi Mansion, he knelt down at the door and kowtowed three times, and said loudly: "Disciple Galangal bids farewell to Master!" The disciple remembers the grace of the Master's teachings, and will never forget it as a teacher for one day and a father for life! So saying, he jumped on his horse, whipped his whip, and whistled away in the night.

Cai Bo closed the door, walked to the door of the study, and asked cautiously, "Sir, are you okay?" ”

Du Wu's deep voice came out: "Is galangal gone?" ”

Gao Xiaolangjun kowtowed three times at the gate of the mansion, saying that the teacher would never forget, and then rode away. I saw him crying very sadly. ”

"Okay, I got it. Caibo, please go and summon Guangbai. ”

Cai Bo agreed, and after a while, the energetic Guangbai came to the door of the study, knelt on the ground and said loudly: "Disciple Guangbai, see the master." ”

"Come in."

After Guangbai entered the door, he just wanted to kneel down again, but was persuaded by Du Wu: "There is no need for so much red tape between you and me. Let me ask you, do you really want to study the Dharma with me? ”

Guangbai said with a solemn expression: "The disciple has experienced disasters since he was a child, and his family has no existence. I met my teacher by chance, I was able to learn Buddhism, I thought I had found a place of peace of mind, and I never thought about my teacher leaving. Since then, he has made a vow to practice Buddhism, but there is no way to learn hard, but fortunately he met the master to solve the confusion of the disciple, and made a supreme and exquisite verse, so that the disciple suddenly opened. The disciple is not talented, he is willing to follow the teacher, serve the left and right, and never break his word. ”

Seeing that he was sincere, Du Wu nodded and said: "That is the case, tomorrow you will ask Zai Heng for your life, follow me to the West Sea, one is to take the test of your Huigen, and the other is to attach to Zai Heng and monitor me for the Chu Palace, if you are willing to agree, I will accept you as a disciple." ”

Guangbai is so smart, after a little thought, he understood the reason, and said happily: "The disciple will meet the master, and early tomorrow morning, the disciple will go to the Chu Palace, and serve as Zai Heng's staff." ”

After Guangbai left, Cai Bo quietly walked in: "Sir, the second son has been waiting for you all night." ”

Du Wu nodded, Cai Bo turned around and went out, closed the door with his hand, and leaned against the small stone table in front of the door to take a nap.

Du Wu walked to the north corner of the study, knocked on the floor, took a step back, only to see the ground clang, revealing a crack, and then the ground fell down and slid to the side, and Du Er's head poked out.

"The head of the house." Du Erwen screamed angrily, and Du Wu hurriedly pulled him up.

"If you get fatter, I won't be able to pull you."

"Hehe, the little one knows, but the chef who is not fat will arouse suspicion." Du Er jumped on the ground and was about to salute Du Wu, Du Wu waved his hand and asked, "How is Zhang Mazi who asked you to check, is there any news?" ”

Du Er shook his head: "No, I only know that he went to Dongting Lake, and I don't know anything else, and the little one once asked someone to send a letter to Caesar for him to help find it, but he still found nothing." ”

"Well, it seems that this man is extremely cunning. That's why I'm looking for you. Du Er, the day after tomorrow I will go to Xihai County, at least a month, at most three months, I will come back. During the time I am away, you and Caibo take care of the pipa, and I will strictly order Caibo to close the door and not see anyone. In addition, I plan to form four halls, namely the White Tiger Gate, the Suzaku Gate, the Flying Bear Gate, and the Red Owl Gate. Baihumen is a full-time attack and battle, and Caesar is in charge, you had better go to Taishan County in person, convey my meaning to him, let him step up his training, and be sure to have a team of no less than three hundred people by the end of this year, as for the financial problem, you put forward my dividend in Qingfeng Building, open another restaurant in Taishan County, don't use the name of Qingfeng Building, find a reliable distant relative to be in charge of this matter, understand? ”

Du Er was a little excited, the head of the family was finally willing to cultivate his own power, and he agreed in a panic.

Du Wu continued: "I have other arrangements for the Vermilion Bird Gate and the Flying Bear Gate, you immediately set up the Red Owl Gate, responsible for intelligence collection and sorting, and you will serve as the master of the Red Owl Gate, and set up an intelligence team in our Han states as soon as possible, always pay attention to the local situation, and report to me quickly if there is any change." ”

Du Er was overjoyed, knelt on the ground and kowtowed repeatedly, and his voice changed: "My subordinates must swear to serve the head of the family!" ”

Du Wu helped him up and patted his hand: "According to my observation, at most ten years, the world will be in chaos, we can't sit still, we must have a force to save ourselves in troubled times." You secretly raise some dead soldiers in case of emergency. Also, this time I went to Taishan County, and asked Caesar to arrange for you to arrange four people to bring back to Chang'an, two to protect Wang Shu, two to protect Zisu, and to Han people, the more ordinary the appearance, the better, not the Great Qin people, understand? ”

Du Er nodded and asked, "Family Master, how should my senior brother arrange it, he has been complaining a little recently." ”

Du Wu thought for a moment and said, "You let him start preparing to open Qingfenglou branches in major states and counties to save money and food for us, let him think about his thoughts first, and come to the house tomorrow morning to find me." Also, this secret passage is only known to you, me and Caibo, even if you are a senior brother and Pipa, you can't reveal it. ”

Du Er nodded, and seeing that Du Wu had no other instructions, he returned from the tunnel again. When he walked into the tunnel, he suddenly felt ambitious: "Maybe I can achieve something great in the future!" ”

After finishing all these things, Du Wu really felt a little tired, stretched his waist, walked out of the study, and Cai Bo came up and locked the door of the study, and carried the lantern to lead Du Wu back to the backyard.

"Pipa has been stuffy in the house for an afternoon today, and I don't know what to do?" Du Wu thought and pushed the door open.