Looking at the pieces of calculation paper that Lao Guo pushed in front of him.
Xu Yun's somewhat tired eyes couldn't help but flash a fleeting and inexplicable look.
If the previous English communication can be regarded as the first wave of 'testing'.
So these questions now should be the second round of tests.
The former tests identity. The latter tests ability.
After all, even graduates from the same university and the same period may have different abilities, some are strong and some are weak.
The two identities of academic master and academic scumbag do not only exist in later generations.
If Xu Yun is just a graduate of Cambridge University's Department of Mathematics, then his value will be just that.
Think of this.
Xu Yun took a deep breath and turned to look at the pieces of calculation paper.
"JΩ(ut2+a2ux2)dx≤et0... "JΩ0(ψ2+a2φx2)dx+ffKtf2dxdt...." A moment later.
Xu Yun breathed a sigh of relief.
Fortunately, it’s a very simple question, as long as you have some skills.
So he slowly raised his head and said to Lao Guo in a tone that sounded like speculation but was actually firm:
"Comrade Guo, this should be...a partial differential equation?"
Lao Guo nodded, the expression on his face did not change much:
"That's right, Comrade Han Li, can you see the specific issues discussed in the equation?"
After hearing this, Xu Yun looked at the calculation paper again and said slowly:
"If I read correctly, this should be a one-dimensional initial value problem. Energy inequality?"
Swish--
Hear the answer given by Xu Yun.
Lao Guo pinched the paper's fingers and immediately exerted some force. He really understands it!
As everyone knows.
The so-called equation refers to an equation containing unknown quantities. For example, there are algebraic equations, functional equations, etc.
If the equation consists of independent variables, an unknown function, and the derivative or differential of the function, then it is a differential equation.
A differential equation with only one independent variable is an ordinary differential equation, or ODE.
A differential equation with multiple independent variables is a partial differential equation, or PDE.
So for an international student in the Department of Mathematics.
Judging that this is a partial differential equation simply through the form of the formula can only be said to be in line with his basic 'personality', which can be regarded as basic literacy.
However, judging from the content of the equation that it is calculating the initial value problem requires strong academic ability.
After all, the hyperbolic equation is considered a high-barrier problem at this time, because the wave equation it covers is directly related to many cutting-edge research.
Not an exaggeration.
These days, many universities refuse to teach relevant mathematics knowledge to Chinese international students.
Seeing Xu Yun give such an accurate answer, Lao Guo suddenly became interested and asked Xu Yun again:
"Comrade Han Li, if you were asked to answer this question, what approach would you take?"
As a result, I just finished speaking.
Lao Guo realized that this question was a bit excessive, and quickly added with a dry smile:
"Of course, think of it if you can. If you can't think of it for a while, don't force it. After all, your injury is not healed yet."
He didn't know Xu Yun's specific major before, so it was naturally impossible to prepare the corresponding "assessment materials" before coming.
The pieces of manuscript paper in his hand were actually calculation papers from a non-core project that he carried with him, and the issues involved had not yet been resolved.
Therefore, the question he raised has a strong element of curiosity, and strictly speaking, it is a bit difficult.
"The idea of solving the problem...".
The result surprised Lao Guo.
Xu Yun just hesitated for a moment and then gave an answer:
"If I were asked to solve the problem, I would multiply both sides of the wave equation by ut and integrate it on K, deform the left side of the equation and apply Green's formula." "Then analyze the positive and negative of each integral term along the boundary of K And do some scaling, and finally use Gronall's inequality, and you should be able to get the relevant solution..."
"K plus integral, Green's formula?"
Lao Guo blinked and subconsciously began to think about the feasibility of Xu Yun's plan.
As one of the earliest science experts in the country, although Lao Guo is not as good as Hua Luogeng and Chen Jingrun in terms of mathematical literacy, his mental arithmetic ability should not be underestimated.
After clarifying Xu Yun's thoughts.
His pupils suddenly shrank. This idea seems...
Is it really feasible? More importantly...
The energy method can also prove the uniqueness of the solution in nature, which is the consensus of the wave equation.
That is to say, what comes out must be...the only solution! Think of this.
Lao Guo couldn't help but turn his head and glance at Cai Shaohui beside him. At this moment.
An impulse emerged in the hearts of the old and the young: return to the project team and deduce this problem immediately! If the idea given by Xu Yun is correct...
The project team can save at least five days of calculation time!
And just when Lao Guo was excited, Lin Yu's voice sounded in his ears again:
"Guo Gong, it's almost time. Look..."
Only then did Lao Guo come to his senses and turned to look at the clock opposite the hospital bed. as expected.
The time at this time has reached 11:30 in the morning, a full twenty minutes have passed since they entered the ward.
See this situation.
Although Lao Guo still had many questions in his mind that he wanted to communicate with Xu Yun, he still had to stand up and said to Xu Yun:
"Comrade Han Li, you have just recovered from a serious illness, and your body has not fully recovered yet. You need to calm down and recuperate."
"So we won't disturb you for now. You just need to relax and recuperate. I will definitely come visit you again in a while."
Seeing this, Xu Yun nodded: "Comrade Guo, goodbye." After Lao Guo and others left.
The nurse rolled down the backrest of the medical bed, hung up another bottle of injection for Xu Yun, and gave him some medicine.
A few minutes later.
Xu Yun lay flat on the bed, and while he still had some energy, he began to think about the problem.
Currently, with the help of a broken version of the Cambridge diploma given by Halo, his identity can be barely concealed.
At the same time, if he expected it well.
In the 'assessment' of the math paper just now, he also gave a passable answer, and he had already reached the maximum limit in his first performance.
Judging from the historical situation he knows.
No matter which of the above points, it can only make his start relatively calm.
As for hoping to alert the leaders with this "talent" and enter the core level of the base, that is purely a daydream.
In other words.
If he wants to gain the trust of the organization, he must make one or more big news.
As big as....
Enough for the leadership to ignore their "originality."
But the problem is that I can't even move now. Is there any way to break the situation?
With this doubt.
Xu Yun's eyelids became heavier and heavier, and he finally fell asleep slowly. ........
And just when Xu Yun fell into deep sleep again.
Lao Guo took Cai Shaohui and Zhou Cai out of the staff hospital and came to the base headquarters, which was only a few hundred meters away from the hospital.
After checking and registering.
The three people quickly arrived outside the office of Li Jue, the general manager of Factory 221.
"Old Li!"
Seeing that Li Jue's office was only half-hidden, Lao Guo left Cai Shaohui and Zhou Cai outside the door, pushed the door open and barged in:
"Good news, good news!"
Li Jue at this time
He was watering the flowers on the windowsill with a small kettle. Hearing this, he couldn't help but stop and asked with a smile:
"Good news? What, Lao Guo, is it possible that the research on the reflection of weak shock waves has yielded results?"
"Weak shock wave? You dare to think about it!"
Lao Guo waved his hands carelessly, walked to the desk, picked up a big tea bowl, raised his head and took a big sip, then wiped the corner of his mouth:
"You came up with the results of the project that was just launched yesterday - it took the United States and the United States more than 80 days to achieve this breakthrough."
"You want to see the results today, okay, go out and turn right to the factory director's dormitory, you will see everything in your dream!"
Li Jue on the side couldn't help laughing when he saw this.
As the general person in charge of the base, he naturally knows what Lao Guo said. The project has not yet been revealed.
Asking Lao Guo about the so-called weak shock wave results is purely to suppress Lao Guo's bullishness.
Then he walked to the table carrying a kettle, looked at Lao Guo, and said to him:
"Okay, just kidding, I can make your foul mouth say the words "good news"... It seems that the injured comrade is in good condition?"
Lao Guo came to the general office to find Li Jue once before, and also asked Zhou Cai, Li Jue's assistant, to take over. Therefore, Li Jue naturally knew what Lao Guo had just done.
It is obvious that Lao Guo can return so refreshed now...
The wounded man must have shown some value. as expected.
After Li Jue mentioned the word wounded.
Lao Guo nodded his head and even snapped his fingers cheerfully:
"That's right, the diploma is not stolen. He is 100% an international student from Cambridge University - he speaks with an authentic London accent, which is more standard than many comrades. He has lived abroad for at least ten years."
"As for the family background, it is similar to what we expected. The family left the country early. After the founding of the People's Republic of China, they were hesitant to return to the country, so they sent him back to the country to find his roots."
"As a result, I encountered robbers on the road and my belongings were robbed. After wandering for a while, I had to steal some tiles - he didn't say the last part clearly, but that's basically what he said."
"Oh, by the way, he calls himself Han Li, but Xiao Zhou told me that this person is not in the files we found, so it must be a pseudonym."
Li Jue remained silent since Lao Guo started to explain. After listening quietly, his face looked thoughtful.
At this time, more than ten days had passed since Xu Yun was rescued from the Way Kiln Factory.
Previously, after Zhou Cai compiled the files of Chinese international students at Cambridge University, Li Jue had discussed Xu Yun's "composition" with Lao Guo.
For now.
Whether it is Li Jue's judgment, Xu Yun's own words, or various realistic evidences, it is basically certain that Xu Yun's statement is correct - at least generally so.
Then Li Jue put the kettle on the table, fiddled with the lid of the enamel cup twice, and asked Lao Guo:
"Lao Guo, just being an international student shouldn't make you so happy, even if you speak English well..."
"Tell me, is it because his physical condition has recovered relatively well, or because his professional level is very high?"
"Okay, Lao Li, your head is moving fast enough."
Lao Guo looked at Li Jue in surprise, shook his head and said:
"The body has recovered very badly. Although Director Lin is trying his best to stuff him with donkey hair, he is still not completely out of danger."
Li Jue said:
"So his professional level is very high?"
Lao Guo nodded. Considering that Li Jue was not a professional, he blurred the specific concept:
"Yes, to be precise, it's very high."
"He graduated from the Department of Mathematics at Cambridge University. As soon as he recovered from his illness, he saw the contents of the manuscript paper I gave him and gave him a very feasible solution."
As he spoke, he paused and added:
"Based on this matter, there are currently no more than ten people in the base who have this kind of thinking ability - of course.
This kind of thing is very random, and it is certainly impossible to compare it like this in reality. "
Li Jue glanced at Lao Guo.
Although he is not a professional scientific researcher, he is professional in trying to figure out people's psychology.
He was silent for a moment, and then asked Lao Guo thoughtfully: "Lao Guo, you mean... add him to the watch list?" Lao Guo nodded, glanced outside the room, and said in a low voice:
"Yes, Lao Li, judging from the conversation, I personally feel that his attitude towards me should be kind, and his awareness can also be cultivated..."
As a result, he didn't finish his words. Li Jue interrupted him: "That's not enough, Lao Guo."
The second half of Lao Guo's words was interrupted. After a while.
Li Jue sighed, took the initiative to pour a glass of water for Lao Guo, and explained:
"Lao Guo, you should know the organizational regulations and procedures. It is impossible for us to absorb such an incompetent person into the system immediately."
"At least what you said alone...is really not enough."
Lao Guo opened his mouth when he heard this, as if he wanted to rescue him:
"But Lao Li, Han Li's situation is different. He is now separated from...
"I know he can't leave the base now, Lao Guo!" Lao Guo was still halfway through his words before he was interrupted by Li Jue:
"I also know that even if he is truly an enemy agent, he will not be able to pass on the information under the current circumstances."
"I know better that our multi-round retest system will not give him the chance to destroy the calculation results, but Lao Guo..."
"The rules are the rules. Our mission is too special and important. We will never allow any unstable factors to appear."
"It's okay for him to use a pseudonym when he misunderstands the policy! It's okay to sneak back to the country! It's still okay to let us treat his injuries for free! But...
Talk about this.
Li Jue put his hand on his friend and colleague and said word by word:
"It is absolutely impossible to let him enter our project."
"Lao Guo, our project concerns the entire country and whether hundreds of millions of compatriots will crawl on their knees or walk on their feet in the future. We must maintain absolute rationality that is unreasonable and even illogical."
"Perhaps he is a talent for you, Lao Guo, and has given you some surprises, but from the perspective of me, the factory director, he is far from enough."
Looking at Li Jue who spoke earnestly and thoughtfully, Lao Guo Muran.
After a while.
He nodded slightly: "Old Li, it was me who was rude."
Li Jue's chest relaxed slightly when he saw this. What he was most afraid of was that Lao Guo would fight him to the end because he "cherished his talent".
Then he opened his mouth and was about to speak, but he heard Lao Guo say: "So Lao Li, if you let him calculate some data without revealing the real situation, it should be okay, right?"
Li Jue was slightly startled, then nodded after recovering:
"Of course. Based on pure data calculation, the base is indeed short of manpower at the moment - isn't this one of the purposes of rescuing him?"
"We won't discuss the watch list and core projects. He can have access to ordinary data."
The expression on Lao Guo's face softened a little. But soon.
Another thought emerged uncontrollably in Lao Guo's mind: "Speaking of Lao Li, is it really impossible for him to be on the watch list?" Li Jue glanced at him and said firmly:
"Unless he reveals all the information about his three generations of ancestors and verifies it clearly, there is no need to even think about it!"
Lao Guo still refuses to give up:
"What if he contributes a lot?" "Contributes a lot? It's impossible even if he contributes a lot."
Li Jue snorted coldly, then suddenly thought of something and pointed out the window:
"Let's put it this way, Lao Guo."
"If he can be put on the observation list without telling his true situation, I will go and chew the ax given to you by your teacher on the spot!"
Note:
Grandma's condition suddenly became a little worse. She was not as serious as being admitted to the ICU, but she was in an emergency. The indicators are not very optimistic. Today is a bit short. I will take leave tomorrow. I'm sorry.
