The night in the mountains is silent.

The starry sky was full of stars, a crescent moon hung quietly in the southwest sky, the cold moonlight sprinkled on the earth, and the surrounding mountains appeared even darker, like an ancient beast.

Not far from the front of Kong Shucheng, a large bright open space can be faintly seen, and after continuing to walk forward for a few dozen meters, I found that the original open space was the famous "Fairy Lake" in Mangshan County.

At night, the lake is quiet, and the surface of the lake is covered with fog and mist. The stars overhead form a dreamlike reflection in the lake, like elves hidden in the lake.

It's beautiful.

Kong Shucheng rarely travels alone, especially not on such a night, one goes deep into the countryside and mountains. In my heart, I was full of excitement, novelty, and even an inexplicable touch.

Just as he was reveling in the beautiful scenery in front of him, there was a sound of light footsteps behind him.

When I looked back, it was her.

Just now, the girl on the bus.

A "high-energy girl" who can understand "linear mathematics".

"Why are you?" Kong Shucheng turned around and gave her a serious look.

Under the moonlight, she is not as tall as Zhou Luoxia and Shamo, but she is not short, about 163. Appearance, although it is not the same type as the small curly hair sand foam, but it can also protect 8 for 9 and tie with the sand foam. As for temperament......... Well, that's not a good thing to say, after all, she hasn't spoken much, and she has a copy of Linear Mathematics and Its Applications in her hand.

The distance between the two is only a few meters.

Maybe she wasn't used to being scanned so closely by boys, so the high-energy girl also lowered her head a little shyly: "Just now, thank you so much!"

She finally spoke, not loudly, but full of sincerity.

Kong Shucheng smiled: "It's okay, the road is uneven and roared." Oh, by the way, are you here?"

The girl shook her head: "I'm here to find someone, what about you?"

"Haha, what a coincidence? Actually, I'm here to find someone. ”

"Are you looking for a prisoner?"

"Hehe, of course not. ”

"I knew you weren't. ”

After saying this, the girl suddenly laughed again.

Kong Shucheng: ".........?"

The girl said: "Actually, I knew that you were not a policeman. ”

"I didn't say I was a police officer, I was just a trainee police officer. ”

"Neither are trainee police officers. ”

"........." Kong Shucheng smiled: "How do you know?"

"Because when you got on the bus to buy a ticket, I saw that you were holding a student card from Dongrao No. 4 Middle School in your hand. ”

"Uh........."

"But I still want to thank you, I don't know what I would have done if you hadn't stepped up in the car. Oh yes, what's your name?"

"Kong Shucheng. Confucius is the Confucius of Confucius, the book is the book of the book, and the success is the success of the ........."

"When sending books is not only when geese come, but also fear, books become geese. The girl smiled and recited a poem by Yang Yanzheng of the Song Dynasty "Queqiao Immortal: Thinking of the Return Season", and then introduced herself very generously: "My name is Li Ruiyun." ”

"Li Ruiyun, when I heard your name, I knew that you must be a master of mathematics. ”

"Oh, yes?" Li Ruiyun tilted his head, waiting for Kong Shucheng's answer with interest.

Kong Shucheng: "If I'm not mistaken, the first female doctor in our Huaxia Kingdom is called Xu Ruiyun." She is engaged in analytical mathematics and is particularly good at trigonometric series theory. Back in the 40s, she published a paper on trigonometric series in the famous German newspaper Mathematical Times. ”

"Well, classmate Kong Shucheng, I didn't expect you to understand so much? Yes, you're right, my name was actually taken by my uncle. Roughly speaking, as you said, Uncle hopes that when I grow up, I can also do something in mathematics. ”

"It seems that your uncle is also very powerful. ”

"Well, of course, my uncle is not ........."

Li Ruiyun stopped talking, and then changed the topic and said: "Classmate Kong Shucheng, why are you coming to our Mangshan County? Are you visiting relatives?"

"It's not. I'm here to find my teacher. ”

"Teacher?"

"Yes, my math tutor. ”

"You are studying in Dongrao No. 4 Middle School, why is your math tutor so far away? It takes two hours to take the bus. ”

"Uh, that's a long story........."

Kong Shucheng looked at the row of bungalows in front of him, and then asked Li Ruiyun: "Here, it should be Pingding Village, right?"

"Yes. ”

"Have you ever heard of a person named 'Pingding Tiegui Li'?"

"........." Li Ruiyun frowned: "I haven't heard of it." ”

"Then can I take the liberty of asking, what is your uncle's name?"

"My uncle's name is Li Luogan. ”

"Wow, your uncle's name is also very similar to the name of a mathematician. ”

"Yes. Hua Luogeng, haha!"

Li Ruiyun also covered his mouth and snickered.

Kong Shucheng looked at her smile and suddenly asked, "How is your uncle's leg?"

"You ........." Li Ruiyun immediately lowered his face and looked very angry: "What do you mean?"

"Oh no, it's not interesting, I mean ........."

"Don't talk about it. I can tell you that my uncle is very nimble on his legs and feet, and he also plays football very well, so he is not the kind of calm iron crutch Li you are looking for. ”

Li Ruiyun's angry appearance was not as ugly as he imagined.

On the contrary, there is a feeling, and there is an indescribable taste.

Kong Shucheng hurriedly apologized: "I'm sorry, it's all my fault for being a teacher, mistakenly thinking that your uncle is ......... That's the guy I'm looking for. ”

"It's fine. However, my uncle's house is in front of me, do you want to come with me to meet him? ”

Kong Shucheng pointed to the book "Linear Algebra and Its Applications" in her hand, and asked with great interest: "Do you want to ask for advice on the questions in this book?"

Xu Ruiyun smiled: "No." This is just a basic version of the linear math textbook, and the problems in it are quite simple. ”

"Uh........."

Kong Shucheng didn't want to speak.

If we say that the problems of linear mathematics are "simple problems". Then, the problem of "functions and derivatives" to be solved by him is not at the level of a kindergarten class.

"Classmate Li Ruiyun, I think your age should be about the same as mine, right?"

"I belong to the horse, Kong Shucheng, what about you?"

"I am a sheep. ”

"Oh, then I'm a year older than you, and I'm also a senior sister. ”

"You're a junior in high school this year?"

Li Ruiyun shook his head: "Guess." ”

"Senior in high school?"

"........." Li Ruiyun (┬_┬)

Kong Shucheng: "Haha, just kidding, I guess you're already in college." ”

Li Ruiyun nodded: "It's a sophomore this year." ”

“.........”

Kong Shucheng suddenly felt a certain flower.

No wonder some people complain that the current college entrance examination, from a certain point of view, is actually more beneficial to girls, because the physical and mental development of girls is a little faster than that of boys. Facts have proved that more and more top students are also girls. Of course, there is nothing inherently sexist about this argument. The world is originally composed of male **yang, and examples of women not letting their eyebrows shave abound.

Oh yes, Professor Yan Ran is also such an open-minded female scholar.

"Which university are you studying?" Kong Shucheng couldn't help but ask.

"Yat-sen University. ”

"Wow, that's amazing, you were admitted to Yat-sen University at the age of sixteen?"

"What kind of cow am I? I don't have my uncle's cow. ”

"Wow, since your uncle is so good, can you take me to see him now?"

"No problem, my uncle is very good. ”

Saying that, Li Ruiyun was in front and Kong Shucheng was behind, and the two walked towards a two-story bungalow.

It is said that it was her uncle Li Luogan's house.

..................