"It's not accurate enough to just extrapolate to the millimeter. I think it would be better if it could be deduced that the sudden position was over, but during this period of time, I was distracted by the Qiantang War, and there will always be all kinds of unexpected or unexpected mistakes. If you make a mistake, you have to start all over again, which is too laborious and time-consuming. Zu Xiao smiled bitterly: "I am forty and seven this year, I don't know how many years I have to live, it's not that I'm afraid of death, I'm afraid that I won't be able to achieve what I want when I die, and I won't be blind to death......."

Xu You remembered that Zu Chongzhi lived to be seventy-one years old, which was a rare long-lived person in ancient times, no matter how bad Zu Chongzhi was, looking at his spirit, it seemed to repeat Zu Chongzhi's life trajectory, and it should be no problem to live to the age of sixty, that is, there are still more than ten years of good time. But having said that, it is actually a bit of a waste to spend more than ten years of his limited life completely on calculating pi, after all, Xu You, as a person who has come over, once memorized pi to forty-seven decimal places with interest. From the practical application point of view in reality, pi is accurate to a dozen decimal places, which is enough. The American astronomer Simon Newckham once said that ten decimal places are enough to make the Earth's perimeter accurate to within one inch, and thirty decimal places can make the entire circumference of the visible universe accurate to a single amount that even the most powerful microscopes cannot distinguish.

Therefore, the endless estimation of pi is only a later test of computer performance, and it also demonstrates the pursuit and inquiry spirit of mathematicians in the field of mathematics, but it has little practical significance.

What Xu You wants Zu Yu to do may be more ordinary, or simpler, but for a country and nation, it is more meaningful than the digits of pi!

"Sir, with all due respect, circumcision is not the best way to calculate pi, and relying solely on arithmetic is cumbersome, complicated, and time-consuming, but in fact the gains outweigh the losses."

"How can I not know, but after hundreds of years of efforts by the sages, only the circumcision technique can most accurately calculate the value of the rate......

"I don't need to circumcision, I have a few 'formulas', compared to circumcision, it is concise and clear, and it doesn't have to go through years and months, but the highest can push pi to more than 800 ......"

"What?" Zu Xiao suddenly suffocated, feeling that his heart was about to jump out of his mouth, and his voice suddenly became sharp, and said, "More than eight hundred? ”

"Yes, more than eight hundred!"

Xu You remembered that Ferguson calculated the π to eight hundred and eight, which was the highest record of manual calculation of π, and then it was the computer age, and the π value began to grow wildly geometrically, which was beyond the reach of human beings.

Although Zu Yu has a high evaluation of Xu You's arithmetic level, he spent half his life to calculate pi to the millimeter, that is, the fifth, Xu You's lips touched, it was more than eight hundred, it was incredible, and it was unbelievable.

His expression was not so much a god as a ghost!

Xu You smiled: "If I lie, I can say ten or twenty, there is no need to use more than eight hundred to arouse the doubts of Mr." In this way, Mr. pushed to the milli position is nine, and I will first reveal the number of seconds and sudden ...... The second is two, and the sudden is six! Sir can verify the second bit, and then choose whether to believe my words or not! ”

Zu Xiao was completely moved by Xu You's strong confidence when he spoke, and couldn't help but say: "Okay, I will use it for another year at most, and I can launch the number of seconds, and then I will come to Lang Jun for face-to-face advice!" ”

"It's a deal!"

Xu You and Zu Xiao high-fived and swore an oath, and then they got down to business and said, "I came to Qiantang this time to ask Mr. for help in building a stone cannon!" ”

Stone cannons, also known as trebuchets, are not a rare thing, and have been used by warfighters in siege warfare for many years. Zu Xiaoqi said: "There are stone cannons, the lieutenant colonel's office has built dozens of stone cannons and delivered them to the army, but the Qiantang city is strong, and it is useless......

"The stone cannon I'm talking about is not the one you use now, but a modified stone cannon, and I named it the Thunder Cannon!"

"Thunder Cannon?"

Xu You took out the drawings drawn in advance from his arms, Zu Yu was full of doubts, the trebuchet has been developed for thousands of years, and the improved part has already been improved by countless skilled craftsmen, if it weren't for the foreshadowing of the previous debate, Xu You was arrogant and said that he had created a new stone cannon, he would be driven out directly, how to study his drawings?

However, Zu Yu now has great respect for Xu You, and took it over to watch it carefully, first frowned, encountered something incomprehensible, asked Xu You to explain, and then his brows gradually stretched, and then his eyes shimmered, as if he was about to shoot out the brilliance, and sighed after a while: "Lang Jun is talented and talented, both civil and military, and he is the first-class person I have met in this world!" ”

He has never been a sycophant, and he can say such things smoothly without blushing, which shows that he really admires Xu You in his heart. However, as soon as the wind of words changed, he vaguely admonished: "This kind of stone cannon is only used to kill people and seize the city, one stone is fired, the casualties are not counted, I am afraid of hurting Tianhe, Lang Jun is talented, and don't be obsessed with it and ignore the avenue." ”

"What Mr. said is very true, compared to the infinite calculation of the trick, this is all a small skill, less than a bit. If it weren't for the fact that the war in Qiantang dragged on for too long and affected the country, I wouldn't have bothered to study these murder weapons! ”

The two had an in-depth discussion on the specific details of the thunder cannon, Xu You knew the general method, but the selection of rod arms and tendons belonged to ancient secret methods, which required the cooperation of insiders like Zu Qi. In view of the current state of armaments, the weight of the stone cannon originally designed by Xu You was reduced from 800 jin to 400 jin, and the firing range was increased from 200 meters to 300 meters, even so, it was countless times more advanced than the manpower towing trebuchet used by the Chu army, which weighed only 80 catties.

The most important thing is that the Thunder Cannon is the first counterweight trebuchet to appear in this time and space, and it can be operated perfectly by just a few people, which can be said to have improved efficiency and practicality by leaps and bounds compared to the scale of dozens or hundreds of people towing catapults by manpower.

Zu Xiao is worthy of being the best at mechanical manufacturing in Chu State, and it took only five days to build the basic framework of the Thunder Cannon on the basis of the existing trebuchet, and after the initial test firing, it proved that Xu You's idea was fully feasible, and then told Xiao Yushu the truth.

Xiao Yushu was overjoyed, and immediately sent a letter to the Crouching Tiger Division, transferred Meng Xingchun's backbone from Wu County to be in charge of the intelligence system against Fengmen, and sent thousands of Chinese soldiers to closely protect the location of the lieutenant colonel's office, and all matters related to the Thunder Cannon were listed as top secret, and those who came into contact with this matter must be in groups of three or five, and anyone who acted alone would be executed regardless of reason. and unconditionally met all the requirements put forward by Zu Hu and Xu You, asking people to give people, things to things, and money to money, it took a month to finally build the first real thunder cannon.

After the test firing in the hidden valley, Xiao Yushu was stunned by the unimaginable power, and immediately ordered the expansion. At the same time, the siege did not stop, but the strength and intensity were not as good as before, and the white thieves retreated into the city, more than enough to defend, but they also did not have the ability to go out of the city to fight. In this way, the stalemate continued for two months, and the imperial court finally couldn't bear it anymore and sent Wang Chun of the Imperial History to supervise the army in Qiantang to supervise the army.

Wang Chun has always been at odds with Xiao Xunqi, believing that the existence of the Sili Mansion is contrary to the way of the sage, and supervising hundreds of officials so that everyone is in danger is really a bad government, and it should be abolished to appease the people. Xiao Xunqi is in a high position, but he never cares about him, neither does he defend himself in a book, nor does he retaliate, and every time he writes a book, it is also a great wonder of the Chu Dynasty.

Wang Chun can't do anything about Xiao Xunqi, but it is logical to deal with Xiao Yushu. The imperial history of the Chu State is extremely powerful, and everything he sees and hears in the army can be secretly reported to the master, and with a little embellishment of words, it is easy to pour a few basins of dirty water.

Just two days after entering the barracks, Wang Chun found an excuse to whip Xiao Yushu's lieutenant general in public, and slapped Xiao Yushu in the face nakedly, causing great resentment among the subordinates. Xiao Yushu became famous as a young man, after all these years of training, the edges and corners have long been polished, and he is not annoyed, he avoids Wang Chun, and he is messing around in the army, but he just sent someone to keep an eye on it, unless the trouble is out of control, otherwise, it is up to him.

After another seven or eight days, on the third day of the sixth month, Wang Chunjing broke into the tent of the handsome, rushed to Xiao Yushu's case, and said angrily: "General Xiao, you are not in the camp these days, where have you gone?" ”

Xiao Yushu said indifferently: "It seems that I don't need to report to your envoy when I go!" ”

"Humph!" Wang Chun said coldly: "I was ordered by Qin to supervise the Chinese army to conquer all the military, you are the general of the expedition to the east, how can you return from the morning and evening, only care about prostitutes and frolicking and neglect military affairs?" ”

Xiao Yushu smiled slightly: "It seems that someone secretly complained to Wang Yushi, and let's listen to it, how do I coerce prostitutes to play, and how do I neglect military affairs?" ”

Wang Chun was heartbroken, pointed at Xiao Yushu, and reprimanded: "My bitter persuasion, not only do you not repent, but you behave in a formless and arrogant manner. Okay, when I arrive in Jinling, see what happens to you! ”

Xiao Yushu took a sip of water from the cup and said, "I'll wait!" ”

What is more embarrassing than angry eyes and bad words is this indifferent attitude, Wang Chun almost exploded his lungs, and said: "Don't think that with Captain Xiao as a backer, you can do whatever you want." Let me tell you, this court is the court of the Lord, this world is the world of the An family, not your surname Xiao! You command an army of 150,000, in addition to the Chinese army, there are also 2,000 sword swingers, but such a force can not capture a mere Qiantang City in five months, Xiao Yushu, if you say that you are not raising self-respect, who in the world can be convinced? ”

"Smack!"

Xiao Yushu stood up, and the eighteen subordinates in the separate tent immediately held their swords in their hands, cold and murderous, and they were afraid that they would be paralyzed with fright. A good Wang Chun, instead of being afraid, looked up to the sky and laughed, saying, "Kill me? Xiao Yushu, you have already shown your traces, and now you can be arrested, and you may be able to save your life. If you resist stubbornly, the disaster of the future extinction of the clan is imminent! ”

Xiao Yushu waved his hand, and all the subordinates returned the knife into the sheath, and walked forward from the back of the case, he was tall, a head higher than Wang Chun, looking down at the other party, and said: "If you are not afraid of death, follow me to the front of the two armies, tonight, I will personally lead the Chinese army to attack the city, tomorrow dawn, I want no more white thieves in Qiantang City!" ”

"Huh?"

Wang Chun was stunned, and he didn't come back to his senses for a while.