In 1978, I was admitted to Harbin Institute of Technology

Chapter 18: Talking about multi-complex functions to Mr. Hua’s favorite student? Oh my god!
After Wang Zheng left with a complicated expression, Du Guowang added some water to the enamel kettle on the desk and picked up the rattan kettle, which was full of water.

He then covered Xie Wei with the quilt that he had kicked aside and left the room.

After sending Xie Wei home, he went to school to ask for project funds from Xie Wei. When he came back at noon, he had another fight with Liang Hongbin. Up to now, he had not eaten a single grain of rice and Du Guowang was already starving.

The light was on in Liang Hongling's study, and through the window one could vaguely see Liang Hongling lying on the desk, scratching her hair with her hands. Du Guowang was also a technician, so he naturally knew that he shouldn't disturb her at this time.

He quietly entered the kitchen, opened the stove cover, poked out the coal ash in the stove, and made the fire in the honeycomb coal stove burn brightly.

When the water boils, scoop out the yellow-white corn flour from the rice jar using a chipped earthen bowl. Stir with a spoon in one hand and add the corn flour to the pot with the other hand.

After the cornmeal had cooked for a while, add half a bowl of flour into it.

Keep stirring until the pot becomes thick, then take the pot off the stove.

Director Du has rich experience in cooking cornmeal porridge.

After cooking, he went to see Xie Wei first. He saw that Xie Wei had kicked the quilt away again and was sleeping soundly with his legs between the quilt. He pulled the quilt to cover Xie Wei's upper body before leaving.

Liang Hongling was still lying on the desk, writing and drawing, and then stopped.

"Alas, I have to study mathematics..."

After watching for a while, Du Guowang sighed softly.

Standing next to the chopping board, holding a bowl in one hand and chopsticks in the other to pick up finely chopped pickled cabbage, he drank two large bowls of cornmeal porridge to fill his stomach. Then he lay on the desk in Xie Wei's room and wrote. He wrote the project plan while listening to Xie Wei's snoring and thinking about which units he needed to cooperate with the two projects.

"Director Du, you?"

Xie Wei woke up at a little after four in the morning.

With a dry mouth and dazed eyes, he was about to go get some water when he saw Du Guowang sleeping on the desk. He carefully picked up the enamel cup on the table and gulped down most of the cold tea. Before he put it down, he saw Du Guowang waking up.

Is it necessary to protect yourself?
"Are you hungry? I'll go heat up some food for you..."

"Director Du, I'm not hungry..."

"Gulu~"

The stomach is far more honest than Xie Wei's mouth.

"It will be ready soon. I have something to discuss with you while you are eating."

Du Guowang felt that he must tell Xie Wei about the project as soon as possible, otherwise problems would arise.

How could Xie Wei let Du Guowang prepare food for him?
I went to the kitchen and was dumbfounded when I saw Du Guowang holding a pot of light yellow cornmeal paste on the stove and stirring it constantly.

"Teacher Liang and I are usually busy with work, so we eat in the school cafeteria. We only have cornmeal at home. Don't worry, I'll go buy rice and noodles tomorrow."

Du Guowang, who was stirring the cornmeal paste with a spoon, saw Xie Wei's expression change and explained.

"The diets in the north and south are very different. Although the Northeast produces rice, most of it is shipped out to support other places that are short of food. The food supply is also tight. But it's better than your place. The ratio of coarse grains to fine grains is 55:45."

National unified food supply standards.

There is no distinction between levels or classes, and workers are only divided into mental workers and manual workers based on their occupations.

Since the large-scale reclamation of the Great Northern Wilderness in the 1950s, Northeast China has become the Great Northern Granary.

In an era when fertilizers had to be imported and were not in sufficient supply, the yield was not high. Even if we had to support food-deficient areas, the supply of fine grains was not as tight as in other places, and the proportion of fine grains was much higher.

"Director Du, don't bother. Sichuan is a fusion of the north and the south, and it can be made into noodles or rice. When I first started working, I didn't have enough food, so my mother replaced the fine grains with coarse grains to help me get by!"

Xie Wei said.

Just because he didn't want to eat cornmeal porridge, he developed new antimony pots and pressure cookers and sold them himself, even though he knew he would be making things difficult for people like Xu Zhihui.

He originally wanted to say that Bashu was neither south nor north and never participated in the dispute between the north and the south, but in the end he did not speak.

Judging from what Du Guowang has shown in the past few days, if the other party takes his words seriously, it will cause a lot of trouble.

Du Guowang looked at Xie Weiyan's insincere expression, smiled, and said nothing.

"Be careful, this stuff is hot. You have to turn the bowl and drink along the edge."

Du Guowang served Xie Wei a bowl and taught him how to eat it.

"Xie Wei is awake?"

Liang Hongling, with bloodshot eyes and a haggard face, entered the kitchen at some point.

"Are you done with your work? That's great. Drink a bowl of wine quickly. If you don't eat something, your stomach problems will come back."

Du Guowang felt heartbroken when he saw Liang Hongling, who looked haggard.

He picked up the bowl beside him and served Liang Hongling a bowl of porridge. "Don't worry about eating yet. I have a question for Xie Wei."

"what?"

Xie Wei looked at the old lady with a tired face. She was Mr. Hua's favorite student. How could she ask him a difficult question?
This……

The true form is about to be revealed!

"Can you tell me more about your solution to the problem involving multiple complex functions?"

Under the dim light in the kitchen, Liang Hongling did not notice the flash of panic on Xie Wei's face and threw the question out.

He did not take the bowl and chopsticks handed to him by Du Guowang, but stared at Xie Wei with hope on his face.

"I have used your method to calculate many times, but the results are different every time. I can't find the problem."

"what?"

Xie Wei, who was originally in a panic, was stunned when he heard Liang Hongling's question.

No!
"how?"

Seeing Xie Wei in a daze, Liang Hongling frowned as she took another sip of the porridge.

"Eat something first before asking."

Du Guowang, who was holding a bowl and helping to cool it down, looked at Liang Hongling with heartache.

Liang Hongling remained unmoved and stared at Xie Wei eagerly.

Du Guowang glared at Xie Wei and said, "Hurry up and tell Teacher Liang that she doesn't understand why she can't eat. She has been suffering from stomach problems and can't stand being hungry..."

"..."

Facing Du Guowang's completely opposite attitude, Xie Wei, who was drinking corn porridge from a bowl, forced a wry smile on his face and quickly drank the hard-to-swallow porridge.

As a result, I drank too much and it was so hot that I grimaced.

It just happened to be a way to cover up the embarrassment in my heart.

A fake academic master teaching mathematics to Mr. Hua’s favorite student?
What a fuss!

"I told you not to drink it like this. Talk to Teacher Liang first and let it cool aside. If I had known, I wouldn't have been so hot just now."

Seeing Xie Wei grimacing from the burns, Du Guowang blamed him.

In the process of solving the problem, Xie Wei had ideas but no detailed process.

As a technical person, the use of multiple complex functions has become his instinct: in the process of solving problems, he directly uses concepts and methods from adjacent disciplines such as Lie groups (Marius Sophus Lie proposed the definition of real manifolds or complex manifolds with group structure), algebraic geometry, differential geometry, topology, differential equations, etc.

While doing the test, he forgot that it was now 78!
This was a time when advanced foreign academic papers were not even available in mainland China.

From 3 pm till now, Liang Hongling has written dozens of pages of drafts, but not only does she not have a clearer idea of ​​how to solve the problem, her thoughts are simply a mess.

"what are you worried about?"

Seeing Xie Wei keeping silent, Liang Hongling frowned. She thought Xie Wei was worried that revealing that he knew too much would eventually lead to some bad consequences.

"If you don't want to study a major you don't want to study, you should show your ability, otherwise..."

Liang Hongling reminded Xie Wei.

The country is short of people in all fields. Students like Xie Wei, who scored close to full marks in the college entrance examination, are often assigned to majors such as advanced mathematics and high-energy physics, which are most needed by the country.

At present, Xie Wei has shown a strong talent and solid foundation in high-energy physics and advanced mathematics. Du Guowang did not hesitate to fight with his brother-in-law for Xie Wei. He must know Xie Wei's potential in the field of mechanical automation. Moreover, Yu Guofeng also went to Chengdu...

Xie Wei’s mind raced.

He immediately understood Liang Hongling's subtext: showing a foundation in more majors would give the school a headache, and in the end, they had no choice but to let Xie Wei study according to his own interests.

What came to my mind was what the professor said when I was taking the multi-complex function course in college: multi-complex function in China was created from the most basic level after Hua returned to China, under the personal guidance of mathematics giant Lu Qikeng and others.

At that time, no one in China was studying multi-complex functions.

Mathematics giant Lu Qikeng was Hua's first student to study multi-complex functions. At that time, the only textbook was the Russian version of "Theory of Analytical Functions of Multi-Complex Variables" which Hua brought back from Moscow.

For a moment, Xie Wei's face looked even weirder.

Teaching advanced mathematics to Mr. Hua’s favorite student?

Good luck!
(End of this chapter)