Tian Wen is also very helpless, he has no musical expertise, he can't play and sing, he is the same as ordinary people, he just likes to listen to songs and sing two sentences in his spare time, his music level is at best five tones online, not out of tune.

As a part-time music teacher in the school, he has not taken a single music class seriously, and his title is only used by the school to cope with the quality inspection of the Education Bureau, so that the leaders know that there are music teachers in the 87th Middle School, just like some units, the disabled must be employed.

Moreover, Tian Wen only takes the salary of a math teacher and the performance of an extra 1,000 yuan as an errand class teacher - other teachers would rather not have this 1,000 yuan than be a bad class teacher. Therefore, the music teacher did not bring Tian Wen a dime of extra income.

However, he is a more serious person, since he is a nominal music teacher, not to mention teaching and educating people - he is afraid of misleading people's children, but he thinks that he needs to improve his personal musical literacy to be worthy of this title. Besides, Principal Qian said that what if the leaders of the Education Bureau carry out a surprise attack and want to come to the school to audit a music class? Of course, this possibility is very small, no more than 0.01 percent, and the leaders have not come to investigate it so far.

Tian Wen is pragmatic and down-to-earth, just for the 0.01% possibility, he calmed down and pondered music, and carefully studied all kinds of music textbooks. He found that there seemed to be some subtle connection between music and mathematics.

To put it simply, he seems to be able to compose music using mathematical laws, even if he is a layman who doesn't know anything about composition, he wants to try his hand at music composition with his talent in mathematics and inspiration in music.

Tian Wen plucked up the courage to ask his supervisor if he could use this as the topic for his doctoral dissertation.

His mentor also thought that his research angle was novel and could be given a try, and praised him for his boldness. But it also warned him that the subject was extremely difficult, and that Tian Wen had to write a beautiful piece of music that was recognized by music professionals using mathematical laws in order to prove that his argument was correct and that his paper could be published. If he fails, he will have to postpone his graduation, and he will definitely not get his doctorate next year.

Recently, his thesis hit a bottleneck and stopped, he meditated every day, scratched his ears and scratched his cheeks, except for preparing for classes and attending classes, all his time was spent on this, he didn't know if the problem was in mathematics or music. He looked at the paper that was blown all over the ground by the wind, and sighed, everything really didn't go well.

Ye Tang saw Teacher Tian's sad face and realized that these materials were his privacy, she didn't take another look, and bent down to pick up the other papers.

The other students didn't move, they all had an attitude of hanging up on their own, Chen Yumo hesitated, and followed Ye Tang to pick up the paper, Cen Yannan put the rest of the breakfast on the table, and also joined in.

Tian Wen looked at this scene in a daze, thinking that his eyes were spent, and the two most ruffian and most disobedient students in Class 8 actually helped him do things?! Ye Tang is well, Cen Yannan and Chen Yumo have also modified?

The three of them collected the materials scattered in the classroom together, sorted them out by Ye Tang, and sent them to Tian Wen, who answered the teacher's question by the way, "Yes, I know Euler's theorem." ”

The surrounding classmates looked at each other, what is Euler's theorem? Who is Euler?

Euler's theorem is the knowledge of basic mathematics in college, and it is not a compulsory/optional mathematics content in high school.

However, it has been many years since Eighty-Seven Middle School sent students to participate in math competitions, because whether it is a university subject competition or a small subject competition, their students have been brushed off in the preliminary round, which is miserable. Rather than being the laughing stock of other high schools, it is better to be self-aware to stay away from the competition from the beginning, and also save on registration fees and training expenses.

"How can you possibly know Euler's theorem?!" Tian Wen didn't stammer when he said this, but you can imagine how shocked he was.

Ye Tang said lightly, "Of course I know, this is common sense, and I'm not a fool." ”

After hearing the academic term of Euler's theorem, Cen Yannan, Chen Yumo, and other classmates, who had been confused and didn't know what to do, were collectively speechless.

A male classmate said unconvinced, "Ye Tang, it's a good thing that you're sick, but why did you become pretended?" ”

Tian Wen glanced at the male classmate, "In... At school, note... Note the text... Civilized language! ”

The boy rolled his eyes.

Tian Wen was not angry, as long as the student scolded him without knowing and spat out fragrant mouth, he was content.

He said to Ye Tang, "Then you can talk about the content of Euler's theorem," in fact, he didn't believe that Ye Tang could say anything at all.

"This theorem is a bit troublesome to say, and my ability to describe it verbally is limited, so I have to write it."

The other students pouted and concluded that Ye Tang was bragging and not writing drafts, and he didn't know how to pretend to understand.

Tian Wen patiently walked back to the podium, put away his paper first, then took out a piece of chalk and handed it to Ye Tang, whether what Ye Tang said was true or liar, he should give her a chance to prove herself, anyway, she had half an hour of self-study in the morning, so as not to delay his teaching and that of other teachers.

"You... You put the euro... Europe... Euler's theorem writes... Write it out for... Show me, really... Practice is the test of... Verify the truth... The only thing that is true is... The only criterion. ”

Ye Tang didn't take the chalk immediately, she looked at the different eyes of the classmates around her, Cen Yannan wanted to speak and stopped, Chen Yumo still looked surprised.

She smiled at them, then took the chalk, stepped up to the podium, faced the blackboard, and after a moment's thought, began to write stroke by stroke.

She hadn't written chalk for too long, and her handwriting was a little distorted and childish.

Some classmates laughed at her behind her back, "What an ugly word." ”

Chen Yumo snorted coldly, "If you write, it's not as good as her." ”

Ye Tang heard it and didn't mind, she was self-aware, in terms of art, she did lack a little talent, far inferior to Luo Xingchuan.

Euler's theorem, which is involved in high school math competitions, is usually related to plane geometry, which can be summarized in a formula: number of vertices - number of edges + number of faces = 2.

The Euler's theorem in Ye Tang's cognition is a more primitive derivation, a property about congruence in number theory - this property is the basis of cryptography, and cryptography is the basis of computer system invasion, she can write and deduce this theorem silently with her eyes closed, but the steps are a little complicated, at least a whole sheet of scratch paper has to be written.

So, she really wrote it silently on the blackboard......