Future library

The person who squeezed in the door was a short, thin old man with a red face and smooth skin. There was a lack of vegetation on his head. No matter whether he moved the cover left or right, a large piece of it would always be exposed.

Seeing his image, Cheng Jinzhou couldn't help but laugh out loud.

Mediterranean still smiled and stretched out his hand to pat Cheng Jinzhou twice and said, "My name is Lu Xu, you can also call me Lao Lu."

His hair really needs to be renewed.

Cheng Jinzhou was a little embarrassed and liked his generosity. He smiled and lowered his head to introduce himself: "My name is Cheng Jinzhou, and I am..."

A basin of icy cold water was poured down his neck. Perhaps because it had just reached freezing point, Cheng Jinzhou even felt that the water had turned into ice, connecting him to his clothes. Under the sudden cold, his body felt cold. There was no time to shake, and it fell down like an ice cube...

Liu Kuang quickly supported him, and another star warlock behind him unfroze Cheng Jinzhou in a blink of an eye. Xiang Xin lifted his feet and helped him onto the bed.

Lu Xu watched Cheng Jinzhou's upper and lower front teeth chattering, and continued to smile and touch his forehead: "Don't think you can hold back your laughter, I can hear it."

"Old Lu." Liu Kuang glared and yelled, then said apologetically to Cheng Jinzhou: "I didn't take good care of him. Old Lu..."

"It's okay..." Cheng Jinzhou could only swallow it after gritting his teeth. Lu Xu just waved his hand and used a star technique, and he came hand in hand with a fourth-level star warlock. There was no way he could offend him.

The star warlock behind him took Cheng Jinzhou's pulse for a moment and said softly: "My body is weak and I'm afraid I need to rest for a while."

Liu Kuang's eyes immediately stared at Lu Xu, who smiled stupidly and said, "Just kidding, how did I know he was so fragile."

"He is only 13 years old..." Liu Kuang said solemnly: "When you apologize to others, you are still the one who comes to ask questions,"

"When I was 13 years old, I was already strong enough to kill a cow." Lu Xu said, bowing his head to apologize. He was short in stature, but when he talked about killing a cow, the expression on his face was very humorous.

The sinister Cheng managed to laugh twice. A basin of ice water was indeed nothing. He had made more annoying pranks, but if this kind of thing happened to him, it would definitely not be interesting. It's just that the situation is stronger than the person. Regardless of whether he apologizes or not, he can only endure it with his head down.

"My name is Wang Linghe, nicknamed Changhe." The third star warlock interrupted Cheng Jinzhou's association. As he spoke, he used his right hand to float over ten centimeters away from his back, and saw rich steam rising. It seemed like they were barbecuing human flesh.

After about two or three minutes, Wang Linghe put away his hands and stood up, saying: "Lv Xu is careless and often does not know the importance of things. I'm really sorry. I will prescribe medicine for you in a while. You can rest at home for half a month. You should be able to recover as before, or you can Replenish your energy.”

Cheng Jinzhou didn't want to continue this boring topic, so he asked instead: "Is your skill a medical astrology?"

"There is no such thing as medical astrology." Wang Linghe, who was in his 50s and slightly pale, tapped his slender bamboo pole fingers on the table and said, "I can better judge your pulse and the specific details of the astrology array. Function, please keep it secret."

"I was wrong to ask." Cheng Jinzhou smiled apologetically, feeling the cold air on his body gradually disappearing, and slowly got up from the bed.

Helping him casually, Liu Kuang said slowly: "Actually, I wanted to see you again a few days ago, but I didn't take the time. Xiang Xin asked me a question a few days ago. After reading it, I I can’t wait any longer.”

"oh?"

"I've also heard that, you made up a word called critical wind?" Lu Xu also interrupted hastily.

"Calculus, yes." Cheng Jinzhou basically knew the purpose of the three of them.

People like to say that Newton created calculus, but in fact, calculus also went through a long period of precipitation and brewing. Human beings have been interested in infinity very early. Zu Chongzhi’s pi was born from countless cuts. However, it has become a long process to form a systematic discipline.

The level of mathematics in the Great Xia Dynasty happened to be at the watershed in the transition from elementary mathematics to advanced mathematics. They had already begun to study some parts, but in many aspects, they only had very preliminary ideas.

As a first-level star warlock, the problems Xiang Xin faced were the same problems that star warlocks in the Great Xia Dynasty generally faced.

Although Cheng Jinzhou has never directly answered advanced mathematics questions, he has shown a comfortable mathematical thinking - for real mathematicians, especially mathematicians in the transition period, what kind of thinking should be used to solve problems? is quite important. Elementary mathematics has the ideas of elementary mathematics, and higher mathematics will naturally form its ideological market. This is like when primary school students and high school students face the same chicken and rabbit in the same cage problem. The former must think about the relationship between numbers, while the latter's first reaction should be a linear equation of two variables.

Different ideas determine different solutions.

However, it was impossible for Cheng Jinzhou to teach the calculus knowledge he knew to Liu Kuang and others, even for a fee. On the one hand, he cannot make rigorous proofs and inferences, and on the other hand, this is also his greatest advantage.

Thinking of this, Cheng Jinzhou asked in an evasive manner: "This is just my preliminary idea. It has not yet been proven to be correct..."

He was still worried that Liu Kuang would continue to ask, and did not want the latter to nod noncommittally, and then said seriously: "Cheng Jinzhou, are you interested in serving as a consultant to the Hexi Transportation Department?"

The Transfer Envoy Division is the secretariat of the Transfer Envoy Yamen, the so-called think tank. Liu Kuang's question is actually inviting Cheng Jinzhou to join Liu Bin's field division team.

As a fourth-level star warlock, his solemn tone was already considered an honor.

Cheng Jinzhou remained silent. The Cheng family was a vested interest. If it wasn't for the sake of face, he would have refused directly. What his cheap father-in-law, Comrade Liu Bin, did was purely thankless.

Liu Kuang said in a slightly praising tone: "The several suggestions you have made have greatly helped the progress of the project. You are talented in this area..."

Seniors appreciate juniors so much, just like a director supports an actor, a boss takes care of a secretary, they all have a purpose.

If he is a child who is not experienced in the world, he may have been deceived by Liu Kuang. However, Cheng Jinzhou was half lying on the bed calmly. He looked around and said, "I don't know how many contribution points it takes to replace the star array on your body." arrive."

"I am a level 2 star warlock, and I spent 4,000 points using a level 2 star formation." Lu Xu couldn't speak for a long time, scratching his head and head anxiously, finally finding a question he could answer, and he couldn't remember the prank just now.

"4,000 points is so expensive." Cheng Jinzhou looked at the ring on his hand - Zhou Papi was the same Zhou Papi, and Yang Bailao each had his own usury.

Lu Xu said proudly: "It took me 20 years to switch to this star array. Many people are afraid it will take them 40 to 50 years."

Cheng Jinzhou was dumbfounded. Working as a star warlock for 20 years is quite a scary thing. Even if you just rob a bandit bank every day, after 20 years, you will still be able to buy four or five Cheng families without any problem.

While Liu Kuang was still waiting for further persuasion, there was a loud noise outside the door. The volume was getting louder and louder, and it was also mixed with crying and howling. Without a few people asking, a servant reported: "Someone was crushed to death in the temple in the west of the city. "

…