Zhang Cang returned to his villa.
Although the Half-Saint can open his own palace, he doesn't want to move out yet.
He took out his own foundation, "Nine Chapters of Arithmetic".
He looked at the arithmetic book with a confused look on his face.
This is the foundation of his career.
But today, he wants to make major changes to this book.
The book "Nine Chapters on Arithmetic" is divided into 9 chapters and 246 examples. Its content includes nine chapters: Fangtian, Corn, Shaofen, Shaoguang, Shanggong, Loss and Loss, Profit and Deficiency, Equations, and Pythagorean. It can be said to be rich in content and extremely complete.
But after reading Xu Kai's "Elements of Geometry", he felt that his book had many shortcomings.
Xu Kai's system is established with as few axioms as possible, and then other propositions are deduced and proved through strict logical reasoning. These proved propositions can be continued to be used in subsequent proofs, making it a strict system. .
Zhang Cang believes that the reason why he has been in Semi-Sacred Card for so long is because he has not established numerology as a systematic discipline. Confucianism, Taoism, Mohism, famous scholars... all have their own systematic methods of explaining the world, but their own mathematicians have not been able to establish it.
Zhang Cang wrote quickly and rewrote his "Nine Chapters on Arithmetic" using Xu Kai's axiomatic method. This is what solidifies the foundation of sanctification.
…
…
The next day, Xu Kai and Huang Tu got up early. Huang Tu picked up a bucket of water and washed his body, which was covered in mud from sleeping buried in the soil, before heading to the Confucian Department.
Xu Kai went to the Mo family as mentioned yesterday.
Mo Cen stood at the gate of the Mo family and greeted him with a smile.
Even a large family like the Mo family, which has a sub-sage, would not reject a scholar of the holy path, not to mention that this scholar of the holy path was proposed to be a disciple by a semi-saint.
Although I don’t know why Xu Kai refused, it is enough to prove Xu Kai’s talent.
Mo Cen taught the newly arrived Xu Kai a lot of basic common sense in Tianxiang. Xu Kai nodded in agreement after hearing this.
The two came to the Mo Family Department and began to listen to the lecturer.
The classrooms in Tianxiang are very different from the teachers in Dingzhou Academy of Sciences. If the classrooms in Dingzhou National Academy of Sciences are very similar to those in middle and high schools, each person has a fixed desk, and the desks are not connected at all, then the classroom in Xiang that day was similar to the large classroom in Xu Kai University. Rows of tables and chairs are connected together, and there are no fixed seats. Where you want to sit depends on your own ideas.
Xu Kai deliberately wanted to show his face more, so he planned to go to the first row.
But Mo Cen shook his head and signaled him not to go.
Xu Kai was puzzled, but persisted.
Seeing this, Mo Cen sighed and gave him a small round ball, saying that it would protect him when he was in danger later.
Xu Kai was even more confused. Didn't Mr. Wang assure himself that Tianxiang was absolutely safe?
So Xu Kai sat in the first row.
Sitting here, he could clearly feel the admiring looks coming from all around him, so he became even more restless.
Finally, it was time for class, and a middle-aged man in black clothes walked up, with a long beard that reached his chest. The beard looked like it had been carefully taken care of.
"This class is a mechanism class. As usual, we will demonstrate and evaluate the mechanism you made."
Xu Kai was a little excited. The Mohist family was famous for its mechanical skills. In his previous life, it was said that the Mohist family had created a wooden kite that could fly for a whole day, which was extremely miraculous. I wonder what the Mohist machine arts in Tianyan Continent can create?
"Last time our theme was 'Building Bridges'. We all know that building bridges is very important. Ancient ancestors often had difficulty communicating because of a river, but building bridges can make communication between two places possible. Now, Even if we master a way of practice that is more suitable for the human race, the role of bridges must not be underestimated. In addition to helping ordinary people, we can also suppress the water monsters by building bridges to maintain the waters in our human domain. Safety."
Xu Kai nodded. Unexpectedly, building bridges can also be used to suppress water monsters. This is probably the function of bridges that can only be found in Tianyan Continent.
"Our last topic was to build a bridge within a given range that can unfold on its own, is strong and reliable enough, and can suppress water monsters. The less material costs are spent within this range, the more benefits we will gain in this class. The rating will be higher.”
Xu Kai suddenly had an ominous premonition in his heart.
"Then let's take a look at the first classmate's work. This is...well, Shang'an's work."
Teacher Nagasu took out an object that looked like a stick from his storage bag, and then picked up a small car that had been placed on the desk. The car carried a heavy-looking object. The teacher waved his hand, and a clear spring appeared on the desk to simulate the river water. In the river water, some tiny creatures like flies could be seen moving. Those things must be the simulated water monsters.
Nagasu-sensei found a button on the stick, he pressed it, and the stick unfolded into a bridge. The bridge looked very strong and reliable, and in fact it was so. The heavy car crossing the river actually made the bridge built of ordinary wood not tremble at all.
The structure of the bridge itself can also produce a constriction effect on the energy of heaven and earth, making the concentration of heaven and earth energy on the bridge higher, thus exerting a suppressive effect on the water demon below.
The teacher nodded in approval, and then gave an evaluation: "The expansion was smooth and without stagnation; the bridge was strong and durable, and did not tremble when passing by; but the suppression effect on the water monsters only made them unable to move, but it could not expel them, and It uses more materials. It can get a lower grade than B."
A student came up and took down his bridge with some reluctance.
This was the case for several students in a row. The bridges they built were roughly the same. At most, the styles before unfolding were different, and their grades were basically B. This made Xu Kai relax.
That's right, this is the serious Mo family, not the Heshen simulator he played in his previous life.
However, the next one opened Xu Kai's eyes.
I saw a spherical object being taken out by the teacher, and after unfolding it, it turned out to be a trebuchet.
The teacher looked at the trebuchet in silence and motioned to the student who made the trebuchet to come up and demonstrate it himself.
I saw the student tie the cart to the trebuchet, start the trebuchet, activate the catapult rod, and the cart immediately flew out like a cannonball!
Even in mid-air, the car separated from the load it carried!
And it's not over yet. When the car was thrown out, the ejector rod had just reached the center; and after the car was thrown out, the ejector rod continued to rotate and hit the water surface, completely scattering those water monsters!
The car landed steadily on the other side of the river, and then the heavy object it carried fell from the sky and landed steadily on the car.
The teacher looked at the proud student in silence, and finally began his own evaluation: "It unfolded smoothly, was strong and durable, and was able to completely drive away the water demon. But your landing point was carefully calculated, right?"
"No, absolutely not!"
The teacher changed the weight on the cart and asked him to demonstrate again.
This time, the car still landed steadily on the other side of the river, but the heavy object bounced heavily on the lectern and hit Xu Kai directly!
"Why is there someone in the first row!" The teacher exclaimed, and quickly tried to block the flying heavy object. Suddenly he saw Xu Kai, his heart changed, and he stopped taking action.
Xu Kai expressionlessly stretched out a hand to stop the heavy object steadily.
"Not bad." The teacher praised, "I am Hong Yixiu, the lecturer of the organ class in the Mohist Department. Are you new here?"
"I have met Master Hong. The student is indeed a new student. He is studying in Tianxiang. He will decide which department to join in a month."
Hong Yixiu nodded, and then said to the student gloomily: "Yan Wen, is this what you said?"
"Teacher, you are too insidious!" Yanwen shouted, "How can you use an elastic object to carry heavy objects!"
Hong Yixiu said expressionlessly: "It's my business to carry heavy objects. Although you save materials, the safety factor is too low, so you can only get a C grade."
Yan Wen went down with a gloomy expression.
Hong Yixiu took out another cube-shaped object and unfolded it to form...a car?
He looked at the car carefully in confusion, and once again motioned for the author to come on stage to demonstrate.
The student stood up on the stage, picked up the teacher's car and put it on his own car. Then he picked up the stacked cars together and rolled the tires on the table several times. Then when he let go, the car suddenly buzzed. He rushed over at a very fast speed, and the small car he carried crossed the river safely, and the water monsters in the water were also scared away by the loud buzzing sound.
The corners of Xu Kai's mouth twitched. He originally thought that the bridges he had seen in that game were outrageous enough, but he didn't expect that the answers of these people who were proficient in Mo's mechanism skills were more and more outrageous.
Hong Yixiu's face also began to twitch, but looking at him, he seemed to have gotten used to it. Then he started the grading process and actually got a first-class rating.
Fortunately, the next few bridges were fairly normal. Although there were some surprises, they were still within Xu Kai's understanding.
Finally, when Hong Yixiu saw the last name, a look of struggle appeared on his face. Then he took a deep breath and read out the last name with almost gritted teeth: "Mo Cen."
He took out a small wooden ball. The ball was so small that it could be placed directly under the car.
Hong Yixiu looked at the little ball carefully several times, but couldn't figure out how to unfold it. He asked Mo Cen, who confidently said: "Master Hong, the original intention of making the expandable form is to facilitate transportation, but the student believes that as long as the bridge is small enough, there is no need to expand this step, so that a lot of useless work can be saved. step."
"Then how to use this thing?"
"Just put it under the car and slap it on the table."
Hong Yixiu put the small balls under the car as he said, and then slammed the table.
There was a loud bang!
A loud noise that resounded throughout the entire Mo family shook the entire classroom!
The car flipped steadily to the other side of the river in the violent explosion.
The unprepared Hong Yixiu looked at his face that was darkened by the explosion and his messy beard in the reflection of the water, and didn't know what he was thinking.
Xu Kai, who was sitting in the first row, blew out a puff of black smoke and fell straight down.
"Mocen——!!!"
A roar louder than the previous explosion shook the entire Tianxiang.
…
…
In the end, Mo Cen was sentenced to a second-class grade. Because his work is easy to deploy and low-cost, and the explosion directly killed the water monster. The only drawback is that it is not safe and durable enough.
Xu Kai, on the other hand, was taken to the Medical Family Department by Hong Yixiu and Mo Cen for treatment.
After confirming that Xu Kai was fine, Hong Yixiu left a copy of "Mozi" and left. Mo Cen waited for Xu Kai to wake up and said to him with a sigh on his face: "Brother Xu, I told you a long time ago. Don’t sit in the front row, why don’t you listen?”
Although Xu Kai was not seriously injured, he was speechless for the time being, so he blew out a puff of black smoke again to show his dissatisfaction.
Mo Cen looked at Xu Kai with some uneasiness. He was a scholar of the holy way. If he could be allowed to join the Mo family, it would be of great benefit. If he did not plan to enter the Mo family for his own reasons, he might not be able to avoid a punishment. .
After Xu Kai could speak again, he took out a small ball and asked, "Didn't you say this thing can protect me?"
"Yes, but the final explosion was caused by me. This thing recognized that it was mine and naturally it didn't activate."
Xu Kai coughed heavily and coughed up several streaks of black smoke.
He said to Mo Cen: "Brother Mo, I guess your Mo family is very tolerant and open-minded, right?"
"Of course, our Mohist family advocates universal love without aggression and pursues peace, so we are naturally more tolerant." Mo Cen raised his head and chest, and said with some pride, "I wonder how Brother Xu feels about it?"
Xu Kaixin thinks that you can live a lively life. Isn’t this tolerant and open enough?
Under the careful treatment of doctors, Xu Kai recovered quickly, but he could still spit out black smoke from time to time, which made Xu Kai very suspicious of the raw materials of the bomb.
So he just stayed at the doctor's house for a whole day and did nothing except go to the Mo family's department to attend a class.
In the evening, Xu Kai found Wang Xin and said to him: "Mr. Wang, I have an idea. I plan to join the Mo family."
Wang Xin asked with some surprise: "This is only the first day, have you made a decision yet? No more visits."
"It's worth looking at a few more, but I still think that the Mo family is the most suitable for me."
The development of scientific research must have an open and inclusive environment, otherwise things like Copernicus will happen. From the current point of view, Mohism is the most tolerant and open.
After all, Mo Cen is alive and well.
Wang Xin didn't know what Xu Kai was thinking, but still said: "Don't you know the rules of the Mo family?"
"What rules?"
"If you want to become a Mohist disciple, you must go through a series of arduous training. Only those who are qualified can become a Mohist."
Xu Kai didn't take it seriously.
Wang Xin continued: "In addition, the Mohist clan has strict rules. Its members must implement the Mohist ideas when serving as officials in various countries, and what they earn must also be dedicated to the Mohist family."
"Sir, this means..."
"It means that the dividends you get from burning glass must also be donated to the Mo family."
"Sir, I won't join the Mo family anymore." Xu Kai said firmly.
