On June 30th, defense day and graduation ceremony.
Lin Zhaoxi had already made preparations.
She picked up her backpack and checked that the USB flash drive and power bank were all there.
It was already the last day of her schedule. In the morning, she would go to Yongchuan University to defend the modeling competition. In the afternoon, she would go back to school to attend the graduation ceremony. In the evening, she would go to the airport to see Pei Zhi off.
After the phone call that day, Lin Zhaoxi did not confess her love to Pei Zhi.
Although at that time she really wanted to put down the phone, rush to the top of the mountain, and tell Pei Zhi all her heart, but she didn't do it.
Maybe it was because she thought too much, or maybe after she had just heard all about Pei Zhi's past at that time, her admiration was greater than her love.
So after thinking about it, she thought it was a very appropriate moment before Pei Zhi left.
She opened WeChat, and she had a small group with Pei Zhi, Lu Zhihao, Shen Mei and Hanamaki, and in the group, Lu Zhihao was confirming today's schedule with her.
Lu Zhihao—When will your defense end
Lin Zhaoxi—Looking at the arrangement, it should be finished before 11:00.
Lu Zhihao—Then I will wait for you downstairs in the Department of Mathematics, and go to your school with you to attend the graduation ceremony, and then we will send Pei Zhi to the airport together. Is this the arrangement
Lin Zhaoxi—Yes!
After replying, she put away her phone and walked to the living room only to find that there was no breakfast today.
It is rare for Mr. Lao Lin to wear clothes other than the old man's sweater, a short-sleeved shirt and trousers. Although he is straight, he still looks quite formal.
Lin Zhaoxi: "Dad, are you going on a blind date today?"
Mr. Lao Lin was taking medicine in the kitchen. Hearing this, he almost choked.
"Cough" Lao Lin rubbed his mouth: "Have a good chat."
"Then why are you dressed so well today?"
"I'm going to the company today."
Lin Zhaoxi smiled: "Is there a new good-looking aunt in your company?"
Lao Lin suddenly became serious: "Student Lin Zhaoxi, is there any relationship between well-dressed and going in love?"
"There are still some?"
"Then why are you dressed like a boy today, instead of seeing Pei Zhi off?"
Lin Zhaoxi: "..."
It really is impossible to win a fight with Lao Lin, not in this life.
Lin Zhaoxi picked up her schoolbag and left, but within two steps, she suddenly remembered something, paused, turned to look at Lao Lin: "Dad."
"how?"
"Today is my graduation ceremony, is it because of this that you dress so well, but..."
But you yourself forgot.
—
On the bus, Lin Zhaoxi pulled the ring, and Comrade Lao Lin sat on the chair by the window.
It has been very hot these days, there are many tall buildings outside the window, and the glass curtain wall reflects the dazzling sunlight.
Lao Lin used a folding fan to block the sunlight outside the window, and he seemed to be living a very delicate life.
"I'm not interested in your graduation ceremony." Lao Lin was still muttering about the question she had just before leaving the house, "Although your old father is demented, I can use the schedule book, and it's not enough to forget my daughter's graduation ceremony. "
Lin Zhaoxi: "..."
"Of course, even if I really forgot, I won't admit it."
Lin Zhaoxi looked out the window, pretending not to hear what he was saying.
The bus happened to pass by Hongzhuang New Village, where she and Bao Xiaomeng used to live. No matter how fast the society is advancing, the vicinity of the university in the old city of Yongchuan seems to have not changed much.
Narrow streets, historic university campuses. The bus moved forward slowly, passing several universities, and occasionally people who looked like students got on and got off the bus.
They were reading, reciting vocabulary, and chatting, which made Lin Zhaoxi want to take out the books and study
The place where Lao Lin works is one stop in front of the old campus of Sanwei University. He stood up and was about to get off.
Looking into the distance, Lin Zhaoxi saw the familiar school gate, the green grassy campus, and the library looming in the distance.
Lao Lin patted her on the shoulder: "Thank you kind female classmate for giving me your seat, you can sit now."
He likes acting in this kind of play very much. Lin Zhaoxi looked at his father's face, and looked away from the library of Sanwei University in the distance, and blurted out a question: "Dad, which university did you graduate from?"
Lao Lin pulled the railing and was about to get out of the car, but suddenly blinked: "Have you heard of 'leaving school'
"'One Page', is there this university?"
Lao Lin suddenly despaired: "Student Lin Zhaoxi, I hope you can improve your Chinese while studying mathematics."
Only then did Lin Zhaoxi realize which word Lao Lin said, and she was stunned again. Although unbelievable, this seems to explain the fact that Lao Lin's name is not listed in the graduation book of Sanwei University.
"But you've got to attend a specific school..."
"I don't remember, I'm an Alzheimer's patient." Lao Lin was confident.
The bus stopped, the back door opened, and Lao Lin got out of the bus with his hands behind his back.
Lin Zhaoxi fell silent and didn't ask any more questions.
Alzheimer's patients, like Lin, can forget recent events, but their long-term memory should be very clear.
Really don't remember
She doesn't know either.
—
From the old campus of Sanwei University to the old campus of Yongchuan University, there are still a few bus stops away.
Along the way, the roadside is very clean.
Because of the construction of a modern university town in the suburbs, the number of students in the old city has decreased. But even so, the old university area headed by Sanwei University and Yongchuan University is still a famous research center in the country.
There are many national-level research institutes here, and many elderly professors are reluctant to leave.
The bus stops at Yongchuan University Station.
Lin Zhaoxi got off the bus and walked under the iconic white marble archway of Yongchuan University.
Yongchuan University is bigger than Sanwei University, and there is a big lake in the school. Speaking of which, she was only lucky enough to attend a lecture near here when she was participating in a mathematics training camp at Cheese World, and then she never came again.
So when she walked into the campus full of confidence, she began to get lost. As a last resort, she turned on a navigation and finally found the replying place on the notice.
It was a red brick building covered by vines. It looked very old and should belong to the Department of Mathematics.
Lao Wang and Ah Guang arrived early, and they were very nervous when they saw her.
"Teacher, do you have a USB drive?"
"I brought it." Lin Zhaoxi was very surprised
"That's good, Ah Guang forgot!" Old Wang blamed, "So it's useless for you to ask us to bring a spare USB flash drive, because we are unreliable!"
"Yes, we will rely on you to take care of us for this defense!"
Lin Zhaoxi remembered Pei Zhi's warning, looked up at the cold red brick building in front of her, feeling uncertain about the future.
—
The preparation room is on the 3rd floor, and the defense meeting is on the 4th floor.
Each group has a corresponding number, and students have already entered the venue for defense in advance. There were people inside and outside the aisle, but it was unusually quiet.
Several groups of students from Sanwei University who participated in the modeling competition and were promoted to the national first prize also arrived early. Lin Zhaoxi and Lao Wang Aguang walked over to say hello to those groups of students
But when the two of them met each other and looked at each other's clothes, they both stood there in a daze.
The classmate on the opposite side was wearing a suit and tie, as if she was going to a formal company interview. The girl even wore black high heels, looking very formal and professional.
On the other hand, here they are all T-shirts and beach pants. King Lin Zhaoxi wore slippers on his bare feet. Compared with each other, the three of them looked like they were going to sell fish on the beach.
"Why are you dressed like this?" asked the student opposite.
"Why are you dressed like this?"
"Damn, the Department of Mathematics of Yongchuan University and us are deadly rivals, why don't you come here and dress better to win honor for our school?"
Old Wang was also stunned, and after a while he said: "You have a point, but I was negligent."
"Do you really believe it?" The other boy on the opposite side was speechless, "The defense must be dressed in formal attire to impress the teacher, and this time the teacher presiding over the defense is from Yongchuan University, who is very strict. Do not stay."
Lin Zhaoxi sighed slightly, feeling that no matter Pei Zhi or other classmates, they got gossip from somewhere.
She didn't know where the rumors started, but no matter what, they seemed to just be themselves.
She pulled Lao Wang and Ah Guang over, and prepared to find a quiet corner with them, and discuss with them the main points of the defense and the content of their respective statements.
At this moment, a group of students who had just completed their defense came down from the 4th floor, and they happened to be the students who had won the first national prize in their school.
Lin Zhaoxi wanted to go up to ask about the situation, but suddenly stopped in her tracks.
The girl in the defense team cried on the stairs. Lin Zhaoxi knew her name Li Ran. The other boys also looked flushed and seemed very angry.
There are curious eyes all around.
Lin Zhaoxi thought for a while, and when the girl walked down the stairs, she took him to a corner and handed out a tissue, wanting the girl to wipe away her tears. But the girl hugged her directly, put her head on her shoulder, and cried in a low voice, very, very sad.
"What's the matter?" Lin Zhaoxi asked in a low voice after a while.
"The teacher who presided over the defense felt that he was targeting us." The boy said.
"How come, what did the teacher ask?"
"Anyway, they felt that the paper was not done by ourselves, and asked a lot of questions."
Lin Zhaoxi frowned.
In fact, she has also checked some information. The defense of the national first prize and the defense of the graduation thesis have different focuses. The first point of the teacher's inspection is whether the thesis is really written by the student himself.
"Li Ran was too nervous. When the teacher asked about the derivation of the model formula, she didn't answer. I wanted to help answer, but the teacher said that she must speak, and said that Guoyi is not so easy to talk to."
Hearing this, Lin Zhaoxi patted Li Ran's shoulder to comfort her.
"It's not enough to say that it's targeted. It's not that there is a unified paper number, and the teacher doesn't know you?" asked the girl from the other group next to her.
"I know you." At this moment, Li Ran straightened up, and on Lin Zhaoxi's shoulder was a patch of eyeshadow and mascara rubbed on by her.
Li Ran: "I have worked as an academic secretary, academic exchanges, and met Professor Wang who presided over the defense."
The girl next to her didn't understand: "Just because you are a student of Sanwei University, is the professor of Yongchuan University going to suppress you? Isn't that too narrow-minded?"
"Is it because of the graph isomorphism problem?" Ah Guang interrupted suddenly.
"Your thoughts are very dangerous." Old Wang stroked the non-existent beard on his chin, "But I think it's possible?"
"What are you talking about?" Lin Zhaoxi asked.
"I don't know, but Feng Taidou posted a graph isomorphism paper on arxiv more than half a year ago." Old Wang said gossip.
"arxiv?"
"It's an academic website, and the review period for journals is generally longer. Posting on arxiv is mainly to prove that you are ahead of others." A Guang replied.
"Brother Guang is narrow. Its existence is to facilitate in-depth exchanges on a certain issue among our peers..."
Lao Wang still wanted to make a long speech, but Lin Zhaoxi interrupted him: "And then?"
"Then our old Zeng was very brave. Recently, he raised some doubts about Feng Taidou's thesis." A Guang answered quickly.
"'Question' is not accurate enough, and a clear-cut opposition is more appropriate. The academic circle has responded strongly and is pleasing."
Lin Zhaoxi fell silent. The "Old Zeng" they talked about was of course Pei Zhi's tutor Professor Zeng Qingran.
When the modeling contest ended that day, she went to find Pei Zhi to get her schoolbag, and she had met Professor Zeng by accident.
At that time, the atmosphere in the office was dignified, and when Pei Zhi and she went to print the article, they also mentioned the "academic circle"...
She suddenly became a little vigilant, could it be because of this paper
And if she remembers correctly, graph isomorphism... seems to have something to do with the pnp problem