The next day, in the evening, Ye Fei wrote the paper and sent it to his supervisor.

Professor Lu started watching it that night.

"The quality of this paper is ......," Professor Lu was a little surprised: "Yes, there are basically no mistakes, and even if there are mistakes, they are still some minor flaws." ”

Professor Lu has read Ye Fei's graduation thesis, and he can't say how good it is, he can only say that he has some ideas, but it's not too good, and he can't even be considered superior.

But now look at Ye Fei's papers, the quality is very good.

He was a little skeptical about what Ye Fei had experienced this year, and his ability had improved so much.

Professor Lu muttered to himself: "I don't usually teach him much, so I let him read some literature and occasionally take him to do some scientific research projects." ”

Graduate students generally read literature, attend classes, and write dissertations.

If you are a major with a lot of experiments such as chemistry, you will go to the laboratory to familiarize yourself with the experimental tools and processes.

Occasionally, seniors or mentors will take them to do some scientific research.

When I was in my second year of graduate school, I would read literature, open a project, do scientific research, and write a thesis.

The third year of graduate school is to find a job, write a thesis, or take a PhD.

Generally, scientific research is done in the second research, and the first research is done very little.

"It seems that after the summer vacation, I can take him to do some difficult scientific research projects."

Professor Lu sent the paper to Ye Fei, and after Ye Fei received the paper, he revised it according to the prompts of his supervisor, and then sent it to his supervisor.

This time, Professor Lu did not make any further changes, the place that should be changed has been modified, and then Professor Lu asked Ye Fei to come to his office.

Professor Lu's office.

After Ye Fei sat down, Professor Lu said, "Have you decided which journal to apply to?" ”

Ye Fei was a little entangled, and said: "Mentor, let's not talk about which journal to submit to, will the school reimburse the money for this submission?" ”

Paper submission requires page fees, and general journals are divided into provincial journals, national journals and core journals.

Provincial journals are generally 600 to 1,001, national journals are generally 700 to 1,003, and core journals are generally a few thousand.

Like medical journals are the most expensive, reaching tens of thousands.

If it is SCI, the page fee is generally 7,000 to 10,000, and a small part is more than 15,000.

The minimum is six hundred, which is quite expensive for a student, and the living expenses for a week are gone.

CSCD belongs to the core journal, and a page fee costs several thousand yuan, and Ye Fei really can't afford it.

"Where do you want to go?" Professor Lu laughed and said, "If the school reimburses the students for their contributions, then the school will not be bankrupt." ”

"Hey......" Ye Fei's face was full of confusion: "Mentor, if I don't vote for CSCD, this page fee is too expensive, I can't afford it, you also know my family situation, my family is a small noodle restaurant, the annual family income is more than 100,000 yuan, and my living expenses are only 2,000 a month." ”

If you vote for SCI, Ye Fei doesn't need to be so entangled.

If the paper goes into SCI, the school has a reward.

Depending on the impact factor, the rewards are also different.

The minimum is four thousand, and the maximum is five hundred thousand.

But the trick is that it is clear that the CSCDA area is equivalent to the first and second areas of SCI, but there is no reward for voting in CSCD, only there is a reward for voting in SCI.

Professor Lu shook his head amusedly and said, "Okay, I've thought about it for you, your paper is attached to my scientific research project, and the contribution money will be reimbursed from the scientific research project." ”

Ye Fei looked up in surprise and said with a smile: "Mentor Xie." ”

Then he hesitated and said, "Mentor, do this, over there at the school?" ”

The scientific research fund school is to be investigated, and if there is a problem, the person in charge of scientific research is responsible.

Professor Lu said: "I will just put your name in the scientific research project at that time, and the school will not be able to find out." ”

Ye Fei was relieved when he heard this.

"Tell me, have you decided which journal to apply to?" Professor Lu asked.

Ye Fei shook his head and said, "I don't know, mentor, do you have anything to recommend?" ”

Professor Lu thought for a while and said, "The quality of your paper is good, and there should be no problem in Zone A, but Zone A is also divided into many journals, and different journals have different levels of difficulty in reviewing." ”

There are many journals in Xia Guo, but the most famous ones are the three major categories, which are PKU, CSCD, and CSSCI.

The full name of PKU is Kyoto University Library.

The full name of CSCD is the Literature and Information Center of the Xia Academy of Sciences.

The full name of CSSCI is Jinling University Chinese Social Sciences Citation Index.

CSSCI is a bit more advanced than CSCD.

Papers that are included in CSCD and are included in CSSCI are classified as Class A, the rest are Class B, and Class C belongs to journals that have not entered CSCD.

"The best journals in mathematics are Chinese Science, Science Bulletin, and Acta Mathematica Sinica, followed by Mathematical Research and Discussion, Annals of Mathematics, Journal of Applied Mathematics, Computational Mathematics, and Advances in Mathematics."

"Then there are Systems Science and Mathematics, Applied Probability and Statistics, Journal of Computational Mathematics in Colleges and Universities, Journal of Applied Mathematics in Colleges and Universities, and Journal of Mathematical Physics."

"I recommend investing in Systems Science and Mathematics."

"Okay!" Ye Fei nodded.

He didn't understand this, so he naturally listened to the advice of his mentor.

"You know the rules for submitting papers!" Professor Lu said.

"Of course I do." Ye Fei said with a smile: "First hang the paper to Arxiv, occupy the pit, and then send the paper to the journal." ”

"Yes!" Professor Lu nodded: "Then you can go back and vote, wait until you vote, after the review is passed, after receiving the email, you give me a screenshot of the email, and I will reimburse you." ”

"Okay." Ye Fei stood up and said, "Goodbye, mentor!" ”

After returning home, Ye Fei first hung the paper on Arxiv, and then sent the paper to the editor of the Journal of Systems Science and Mathematics.

The corresponding author of the paper, Lu Yishan, the first author, Ye Fei, is from the School of Mathematics, Zhonghu University, Shadune City, Zhonghu Province.

When the paper was sent out, Ye Fei took a long breath and finally finished it.

He took a look at the system and saw that the task had been completed, earning 5 points.

At this time, it is already the beginning of May, and there are more than 20 days before the summer vacation.

Ye Fei looked at the other three roommates, who were still desperately writing papers.

He is very comfortable in his heart, and when something is successful, the sense of accomplishment and relaxation is very refreshing.

And it's even more cool to see that others are still working hard.

Human happiness is often because others suffer, so happiness is not connected.

"What to do?" Ye Feixin said: "Go and visit Stack Exchange." ”

During this time, in addition to writing papers, he also spends half an hour to an hour every day to watch Arxiv and Stack Exchange.

It taught him a lot.

As soon as he entered Stack Exchange, he received a message from Goofy.

"Hey, how much do you know about the odd cardinality?"

The singular cardinality problem, which belongs to the set theory problem, is also one of the unsolved mathematical problems, and it appears earlier than the continuum hypothesis problem.

There is a problem called the potential determination problem of the power of an infinite set.

This problem is a problem that determines the continuum hypothesis, while the potential problem that determines the power of an infinite set requires a singular cardinality problem.

This is a loop, and the singular cardinality proves the potential problem of the power of an infinite set.

The potential problem of the power of an infinite set proves the continuum hypothesis problem.

"Singular cardinality?" Ye Fei thought for a moment and replied, "I know that it can be used on the potential of the Cartesian product that can list uncountable sets. ”

"And if you prove the odd cardinality, you need to use the regular cardinality."

Singular cardinality, also known as non-regular cardinality, is the opposite of regular cardinality.

Gao Fei said: "I see that you answered two days ago that you used the axiom of choice to solve the power operation of the cardinality, this is a singular cardinality problem, how about it, are you interested?" ”

Ye Fei was stunned, this is a strange cardinality, a hundred-year-old problem, no one has solved it so far.

Of course, there are interests, but you also have to do what you can!

No one dares to solve such a difficult topic!

Gao Fei said: "Don't put too much pressure on you, we don't want to solve it, just explore this problem." ”

Ye Fei took a long breath, scared him to death, thinking that this person was going to solve the strange cardinality problem!

"Yes!" Ye Feidao.

After speaking, Ye Fei established a task in the system.

[Mission: Explore the Singular Cardinality Problem (0%)

Details: Do not seek to solve all of them, only partially explore, and preferably write a paper

Reward: 100 points]

"100 points?" Ye Fei was stunned: "Isn't this task difficult?" ”

The reward is not set by him, it is automatically set by the system according to the difficulty of the task he creates.

But it can also be seen from the points that it is twenty times more difficult than the paper published in CSCD.

"Ye Fei, have you handed in your paper?" Zhuang Nan asked.

"Hmm!" Ye Fei nodded.

"Envy!" Zhuangnan Road.

"Ye Fei!" Zhou Lin said: "Help me write, how about a hot pot?" ”

"Ye Fei, help me, I'll introduce a girl to you." Xu Tiandao.

"Get out!" Ye Fei looked at them and scolded angrily: "Lao Tzu regards money as dung, women as enemies, don't use money and women to confuse me." ”

Zhou Lin and Xu Tian were stunned, if you don't help, don't help, don't have a relationship with money and women!

These two things are the goals of a man's life.

If men don't fight for money and women, they will lose their purpose in life.

Losing your purpose in life is like the walking dead.

Ye Fei stood up and said, "Say, if there is any problem, I can help you, but one hot pot is not good, at least three." ”

"Girl, I want high quality."

"Haha, yes!" Zhou Lin smiled: "Isn't it just three hot pots, the master is not short of money." ”

"The quality is definitely high, you have to believe me." Xu Tiandao.