"It's really you!" Luo Xiaoluo didn't wait for Ling Yun to come back to his senses and continued.

Ling Yun was stunned for a moment, nodded a little helplessly, feeling the envy and jealousy that kept coming from all around, and smiled bitterly in his heart, didn't this make himself the public enemy of everyone.

However, Luo Xiaoluo didn't let him go like this, "Why didn't you call me for Lu, didn't you say that it was good?" The ethereal voice coupled with this, a slightly resentful expression, made the surroundings explode immediately.

Ling Yun only felt cold sweat constantly breaking out on his forehead, he was sure to wear the hat of the enemy of the people.

"My little aunt, don't you know how attractive you are!" Ling Yun leaned in towards Luo Xiaoluo with a bitter face and whispered, his action was like throwing a stone into the already boiling water, causing the boiling hot water to burst out.

"What, this guy can't be Xiaoluo's boyfriend!" A boy said in a daze, as if he hadn't reacted.

"Hey, my heart is broken." Another guy who kept clutching his chest said.

"For what? He's not as handsome as me. "The last row of a little white face that looked slightly weak was a little unwilling.

"Do all the beauties of the present like it, this kind of decadent guy."

I have to say that the current Ling Yun looks a little decadent, but on his slightly ordinary face, his eyes are constantly crossed.

Luo Xiaoluo glanced around with a little weakness, she underestimated her influence on everyone, and spread her hands a little helplessly, "I don't blame me!" ”

Luo Xiaoluo didn't refute anything, such a sentence seemed to affirm the guesses of those guys, and the eyes of jealousy and envy made Ling Yun shudder.

Behind, that Zhu Chao stared at Ling Yun with a pair of extremely angry eyes.

"Luoluo, you know this guy who doesn't understand the amorous feelings." I saw that the beautiful woman next to her looked at Luo Xiaoluo with a puzzled and puzzled face, and saw that the relationship between the two people was very good, but she had never heard her say that there was such a person.

Ling Yun glanced at it slightly, and quickly understood in his heart, this little girl is Mu Qingyan, it is said that she is Luo Xiaoluo's boudoir close friend, and the two of them stick together all day long as if they were one person, and I heard that the two of them privately decided to marry someone in the future.

Of course, this is just some gossip, of course I can't believe it, but it can also explain the intimate relationship between the two people, although I haven't seen the two of them, but Ling Yun has heard of these news that are widely circulated in the Polytechnic University.

"Qingyan, this is something that a friend of mine didn't tell you, just take a step back from what happened just now!" Lin Qi remembered now, and the two of them seemed to have quarreled over seats.

Mu Qingyan's face, which was originally a little puzzled, was relieved at once, as if he understood everything, his boudoir friend, who had always known everything about him, actually spoke for someone else this time, and this person himself didn't know him, what does this mean. His eyes kept scanning the bodies of the two people in front of him, making Ling Yun, who had not allowed a little tongue, to look a little embarrassed.

"Humph! This time, forgive him for the sake of Luoluo's face! But what if there's no place for it? He asked with a sly look in his eyes.

"Lingyun, don't hurry up, what else are you listening to at your math level!" Zhu Chao, who had been depressed for a long time, finally found an opportunity to interject, this guy has always been Luo Xiaoluo's suitor, but he was suffering from the fact that his girlfriend in his mind ignored him. is even more because he knows Luo Xiaoluo's identity and background, and he has never dared to mess around.

Seeing his girlfriend talking to Ling Yun like this just now made his heart angry, Luo Xiaoluo didn't dare to do anything to her, but although he didn't know what Ling Yun's identity was, he didn't expect to have any too noble identity.

Luo Xiaoluo heard Zhu Chao's voice, and his face suddenly turned cold, this guy has always been extremely annoying, and he is stalking, and his face is extremely thick-skinned: "Zhu Chao, are we very familiar with each other?" It's the three of us who don't care about you! ”

Zhu Chao saw that Luo Xiaoluo was extremely dissatisfied with him, and he was a little protective of Ling Yun between his words, and the jealousy in his heart was even more difficult to suppress, but it was difficult to say anything.

I had no choice but to sit down indignantly, and the hatred for Ling Yun in my heart deepened again.

Ling Yuncai didn't have the heart to pay attention to this annoying guy, and this guy's identity is not simple, there is no need to entangle anything with him, now in this kind of scene, of course he was embarrassed to let the two girls leave, so he stood up, looked at Liu Moyan on the podium, and looked a little helpless, it seems that this class can't be heard.

"Or the three of us squeeze." Before Ling Yun could speak, Luo Xiaoluo suggested.

Scratching his head, Ling Yun, who didn't want to leave in his heart, sat down again and spread his hands, anyway, he wouldn't lose anything by himself, "As long as you two don't mind, I don't have any opinion." There was a slight helplessness on his face.

His appearance caused an uproar in the crowd below, and seeing Ling Yun's reluctance, those guys with more open minds immediately thought of other places.

Mu Qingyan was silent for a moment and said, "Okay then!" It's cheap for this guy. She obviously didn't have any good way, so she sat down in front of Ling Yun all of a sudden, wanting to see what was good about this incomprehensible guy, and let Luo Xiaoluo speak for him.

At this time, the bell rang for class, Liu Moyan on the podium nodded, looked at Lin Qi and Ling Yun with a slight smile, and then calmed down.

"Mathematics is the study of concepts such as quantity, structure, change, and spatial models. Through the use of abstraction and logical reasoning, it is generated from counting, computation, measurement, and observation of the shape and motion of objects. Mathematicians have expanded these concepts in order to formulate new conjectures and to establish rigorously deduced truths from appropriately chosen axioms and definitions......"

I have to say that Liu Moyan is indeed worthy of being an authority in the mathematical world, his deep foundation has immersed Ling Yun in it, and the memories that were originally tightly hidden in his mind continue to emerge, and what Liu Lao said is constantly confirmed.

For Mr. Liu, he didn't have too many requirements for this class, he just hoped to cultivate more people's interest in mathematics, so that more people could embark on the road of exploring mathematics and solve those mathematical problems that many people were constantly entangled in. ,

With the continuous deepening of mathematics, many people have become drowsy, after all, few people can really understand it when it comes to advanced places.

With a slight cough, those guys who were originally a little sleepy immediately came back to their senses, and after listening to the lecture many times, they already knew that the following were some interesting facts about mathematics.

In the continuous exploration of mathematics, there are many difficult problems, and the most famous mathematical conjecture related to prime numbers in history is, of course, the "Goldbach conjecture". ”

Turned around and wrote on the blackboard.

1. Any even number not less than 6 is the sum of two odd prime numbers;

2. Any odd number not less than 9 is the sum of three odd prime numbers.

On June 7, 1742, the German mathematician Goldbach put forward these two bold conjectures in a letter to the famous mathematician Euler.

This is the famous "Goldbach conjecture" in the history of mathematics. Obviously, the second conjecture is a corollary of the first. Therefore, it is enough to prove only one of the two conjectures.

On June 30 of the same year, in a reply to Goldbach, Euler made it clear that he was convinced that Goldbach's two conjectures were correct theorems, but Euler was not able to prove them at that time. Because Euler was the greatest mathematician in Europe at that time, his confidence in Goldbach's conjecture influenced the entire European and even the world's mathematical community. Since then, many mathematicians have jumped on the challenge and even dedicated their lives to proving Goldbach's conjecture. However, until the end of the 19th century, there was no progress in proving Goldbach's conjecture. The difficulty of proving Goldbach's conjecture is far greater than one might think. Some mathematicians have likened Goldbach's conjecture to the "crown jewel of mathematics".

Since then, many mathematicians have jumped on the challenge and even dedicated their lives to proving Goldbach's conjecture. However, until the end of the 19th century, there was no progress in proving Goldbach's conjecture. The difficulty of proving Goldbach's conjecture is far greater than one might think. Some mathematicians have likened Goldbach's conjecture to the "crown jewel of mathematics".

……。 ”

Liu Lao's words continue to introduce people to the sacred temple of mathematics.

Ling Yun under the podium fell into deep thought, a string of mathematical formulas in his mind, and some methods that he had never seen before appeared over and over again, as if he had entered a state of madness.

He said with regret that although mankind is now only one step away from the final result of Goldbach's conjecture "1+1". But in order to achieve this last step, it may take a long process of exploration .......

"It's not necessarily that no one can't solve it now!" For some reason, Ling Yun, who was originally in deep thought, suddenly said such a sentence, interrupting Liu Lao's words.

It also made many people who were originally immersed in Liu Moyan's words gasp.

Liu Moyan's temper is unknowing.