I failed a course, and the system became my study supervisor.

Chapter 15 Lin Yuxin's Invitation

After continuous research, Xu Ling found two publications that were very suitable:
PRL and JFM.

PRL stands for Physical Review Letters. It is the flagship journal of the American Physical Society and the top journal in physics. Many papers selected for the Nobel Prize were originally published in it.

For example, the paper related to the 2023 Nobel Prize was originally published in PRL.

JFM, the full name of Journal of Fluid Mechanics, is an authoritative journal in fluid mechanics and has great influence in the field of fluid mechanics.

This is also the reason why Xu Ling considered JFM. Although its impact factor is not high, it can gain recognition in the field of fluid mechanics more quickly.

But Xu Ling would not make a decision so easily. These were just the information Xu Ling collected himself.

Teachers like Zhang Yongjie have experience in publishing their own papers and can give more appropriate advice.

……

A few days passed and there was still no news from Zhang Yongjie, but Lin Yuxin, who had not been in contact for a long time, sent a message.

[Are you there? Are you free tonight?]

[What's up?] Xu ​​Ling was a little confused, and his fingers slowly typed out a few words.

Nothing special.

【If there is nothing else to do, then we won’t chat any more. 】

Oh my god! Why is this person like this?
Staring at the phone screen, Lin Yuxin gritted her teeth, feeling extremely aggrieved.

When would she be treated like this? In the past, when she took the initiative to send messages to others, she would always speak softly and eagerly, hoping to chat for a while.

【I want to invite you to have dinner together! 】

Lin Yuxin pressed the screen hard.

【Why did you call me for dinner? 】

Xu Ling typed out this sentence with disapproval.

Ha ha!

Lin Yuxin was so angry that she laughed, and her mood became less anxious.

[I was originally going with my bestie, but she couldn't go due to something urgent. I had already grabbed the coupon and didn't want to waste it.]

After seeing this explanation, Xu Ling breathed a sigh of relief and agreed.

Xu Ling was afraid that Lin Yuxin would get carried away and develop a relationship with her.

I'm determined to become a scientific research expert! How can I fall in love?

But he is so handsome and a top student, so he is extremely charming, so it is understandable that he attracts some women.

He thought shamelessly.

The time was set at six o'clock in the evening, near the school, and the two agreed to meet at the school gate around five-thirty.

……

At half past five, not a minute more or less, Xu Ling was already waiting at the school gate.

As the weather has not yet fully warmed up, it is already getting dark. The dim street lights have been turned on early, shining on the still bare trees on the roadside, which looks a bit bleak.

Xu Ling didn't wait too long. In about a few minutes, Lin Yuxin arrived at the school gate.

Lin Yuxin's outfit today was very special. She wore warm colors, a burgundy hat, and an orange coat that covered her lower body, revealing only her black leather shoes.

For a moment, two completely different atmospheres collided with each other, bringing a great visual impact to Xu Ling.

"Let's go? Why are you standing there?" Lin Yuxin pushed Xu Ling who was standing there in a daze.

Xu Ling quickly came back to his senses, and then the two of them walked out of the school gate, one on the left and one on the right.

Soon, they arrived at the place, which was a hot pot restaurant called Zhou Fuji Hot Pot. Xu Ling had also heard of it. It was very popular in their school.

As soon as he entered the door, he was hit by a wave of heat mixed with fresh, fragrant and spicy flavors. It took him a while to adapt to it. Xu Ling was a little choked and couldn't help coughing twice.

But what he got in return was Lin Yuxin's rolling eyes. "You can't eat spicy food, right?" Lin Yuxin looked at Xu Ling with a strange expression.

"No, I can eat it, but I choked a little." Xu Ling certainly couldn't lose the battle.

Lin Yuxin still had some doubt in her eyes, but she didn't ask any more questions.

As for whether Xu Ling can eat spicy food, the answer is obvious, because he is from Shanghai.

Sure enough, when the spicy chili oil exploded on Xu Ling's taste buds, this Shanghainese man finally revealed his true colors.

"Cough-cough-" Xu Ling was choked and coughed repeatedly. Sweat kept pouring out and his face turned red.

Seeing Xu Ling's embarrassment, Lin Yuxin stopped teasing him and said softly, "If you can't eat it, then don't eat it. I asked you if you could handle spicy food, and you said yes. If I had known, I would have ordered a shabu-shabu hot pot."

Men can’t say no!
Xu Ling waved his hand, rejecting Lin Yuxin's kindness. Under her surprised gaze, he finished the meal with gritted teeth.

After eating, Xu Ling felt that his lips had lost all feeling and his stomach felt like a fire was burning.

Continuing to hold on, Xu Ling followed Lin Yuxin to the front desk to check out, but saw a sign that had been put up on the floor at the front desk at some point.

There was a points problem on the sign!

"The integration region of arctany/x dxdy is: {(x, y): x+y≤1 and x, y≥0}"

Xu Ling's mind suddenly became clearer.

Mathematics is indeed my medicine!
Xu Ling thought secretly.

“Solve this puzzle within 30 seconds and you’ll get a % discount!” the cashier explained.

"Can I enjoy it after using the coupon?" Lin Yuxin asked.

"Okay!" The young lady nodded.

"Xu Ling! It's up to you!" Lin Yuxin excitedly grabbed Xu Ling's arm.

Seeing Lin Yuxin's performance, the cashier girl didn't take it seriously. They do this activity every day, and the questions they choose are not easy. How many people can solve them, let alone within 30 seconds?

Hearing that he was asked to calculate the points, Xu Ling's negative state was completely lifted, and he spoke confidently:
"Time it!"

The cashier girl didn't hesitate and immediately turned on the timer, and the numbers started jumping.

Xu Ling was calm and composed. He didn't even look for paper or pen. He just stared at the question intently.

Lin Yuxin was different; she was visibly nervous. Although Xu Ling was usually very good at math and physics, this was timed, which was somewhat stressful.

"Time's up! It doesn't matter if you haven't solved it. You're welcome to challenge me next time." The young lady said with a smile.

Lin Yuxin was obviously a little depressed.

"No need for next time! I have solved it." Xu Ling waved his hand and said loudly.

Huh? Solved it?

Lin Yuxin's eyes lit up instantly.

Then, Xu Ling gave the answer slowly.

Now, it was the cashier's turn to be shocked.

Did you really figure it out?
Is there really such a great person?
She quickly found the answer and compared it with what Xu Ling said.

It’s actually correct!

Under her incredulous gaze, Xu Ling and Lin Yuxin paid the bill and left the hot pot restaurant.

Walking on the road, with the cool breeze blowing and the math saving him just now, Xu Ling felt much better.

Lin Yuxin still looked excited. It was the first time for her to succeed in this kind of activity, although she was not the one answering the questions.

But the two of them didn't say anything extra. They walked back to the campus in silence and said goodbye to each other.

(End of this chapter)