Meiyi put down the painting in her hand and wrote on the blackboard: "Use four points A, B, C, and D to represent the four areas of the painting in the question. The question can be transformed into whether one stroke can be drawn without repeating it.

It’s a question of crossing these seven lines.”

"If it can be drawn, then there must be an end point and a starting point in the figure, and the starting point and the end point should be the same point. Due to symmetry, it can be seen that the effect obtained from B or C as the starting point is the same. If A is taken as the starting point and end point,

Then there must be an exit line and a corresponding entry line."

"Define the number of lines entering A as the in-degree, the number of lines leaving the line as the out-degree, and the number of lines related to A as the degree of A. Then the out-degree and in-degree of A are equal, that is, the

The degree should be an even number."

"That is, in order to have a solution starting from A, the degree of A should be an even number. In fact, the degree of A is 5, which is an odd number. It can be seen that there is no solution starting from A. In the same way, if starting from B or D,

Since the degrees of B and D are 3 and 3 respectively, they are both odd numbers, that is, there is no solution using them as the starting point."

Meiyi turned around and said to Liu Xi, "Liu Xi, do you understand?"

Liu Xi is very talented, and he almost read the book "The Beauty of Mathematics" written by Mei Yi. After reading it for a while, he understood it.

Many of the goblin students around her were from the Mathematics Department of Deep Spring College. After looking at it for a while, they felt as if they were enlightened. Some of them couldn't help but exclaimed "Ah". They all looked at it with disbelief.

Black-haired human boy.

Who is he?

He looks about the same age as us.

You know, this question has been asked for hundreds of years, and no one has ever been able to answer it. I don’t know how many goblin scholars have struggled to death on this question and died with hatred.

It only took him two minutes!

They couldn't help but feel unworthy of those goblin scholars who worked so hard on this math problem.

Meiyi looked at the crowd and found that Liu Xi's mother had not appeared yet, so she said: "Anyway, there is still some time, so let's do the second question too? For the second question, let me see how to calculate pi without using circle slicing.

……Well……"

Just when the onlookers thought Mei Yi was stumped, Mei Yi asked Liu Xi: "Can students from Shenquan College understand calculus?"

Liu Xi immediately knew in her heart that Brother Meiyi could solve this problem. She said: "It's okay, Brother Meiyi, your books are sold in the Fairy Forest, and they are also available in the library of Shenquan College. I can't read them."

If you know it, you can go and take lessons on your own.”

Meiyi lost her psychological burden and wrote on the blackboard with chalk:

arctanx=x-x^3/3+x^5/5-x^7/7+...+(-1)^nx^(2n+1)/2n+1

When x=1,

π/4=1-1/3+1/5-1/7+....+(-1)^n1/2n+1)

π=4(1-1/3+1/5-1/7+1/9-1/11+..+(-1)^n1/2n+1)

After writing this, Mei Yi said: "I won't expand on the calculation part. It takes too much time. I will write the results I have calculated before directly on it. You can verify it yourself - 3.141592653589793238462643383279502884197169399375105820974944592307816406286208 9986280348253421170679…”

Meiyi was still writing when Liu Mei's voice suddenly sounded from behind: "Meiyi, Liuxi, the groceries have been bought. Let's go home for dinner."

"Okay." Mei Yi threw away the chalk in her hand, and pulled Liu Xi through the crowd of people on the third floor and the third floor under the horrified eyes of everyone.

Liu Mei led a big-antlered deer carrying two vegetable baskets and asked, "What are you doing at the gate of Shenquan College?"

Meiyi said: "I didn't do anything. Liu Xi just took me to have a look around, and then transferred to Shenquan College. Aunt Mei, did you buy too much groceries?"

In the originally bustling Goddess Square, the Fairy Tribe people showed admiration in their eyes when they saw Mei Yi coming back. Some enthusiastic Fairy Tribe girls gave Mei Yi flirtatious looks.

Liu Mei Manchu obviously felt that something was not right about the tribe's behavior, so he said suspiciously: "Mei Yi, you really didn't do anything?"

Meiyi called out to Qu, "Aunt Mei, what else can I do? Liu Xi has been looking at me."

Liu Mei smiled and said: "Yeah, that's right. Let's go."

* * *

Siye, the dean of Shenquan College, heard the banging at the entrance of the college in his office. He felt a little upset, so he went out to take a look and said to the students watching: "What are you doing? What's going on today?"

So noisy?"

When the students saw that it was the dean, they immediately became much quieter. One student said: "Dean, the seven bridges problem and the pi calculation problem have just been solved."

When Siye heard this, she said with a stern face: "You guys are so good at joking. How is that possible?"

When she walked to the blackboard and looked at the writing on it, she was stunned. After reading it back and forth several times, she felt cold all over: "It turns out that this problem can really be solved..."

When she saw the solution to pi, she immediately felt a headache. She was not from the mathematics department. A mathematics teacher next to her who had taught herself "The Beauty of Mathematics" spent about an hour telling her some calculus knowledge, and she finally

I can barely understand the logic of solving the problem.

"Who solved these two problems?" Yotsuba asked.

"It's a human being," one student said.

Siye's heart skipped a beat.

"Not human! He has a golden eye." Some students retorted.

Siye's heart skipped a beat.

"He's a human! His hair is black and his left eye is black! By the way, his name seems to be Meiyi..."

Siye thought: No wonder. Then it's not surprising.

She asked the students: "Do you know where he went?"

Before the student could answer, Siye noticed the painting under the blackboard. She picked it up and looked at it. She was so shocked that she almost fell to the ground. She said in surprise: "Isn't this Liu Xi from Mrs. Liu Mei's house? This is

Who painted it?"

The student said: "Dean, Mrs. Liu Mei asked Liu Xi and that human being to go home for dinner. This was drawn by that human being. He also played a song "To Miss Liu Xi" live in the Goddess Square. I have never

I have never heard such good music.”

The corners of Siye's mouth curled up in a smile, and she laughed unconsciously.

The students were all stunned and a little confused.

You know, since returning from the Tianlu Mountains, Dean Yotsuba has lost all his spiritual abilities, and his health has not been good. He has never shown a smile. I don’t know why he is so happy today.

Yotsuba turned around and said to the students and residents who were watching: "Stop calling 'that human' and 'that human'. Do you know who he is? He was the one who saved us from the evil dragon in the Tianlu Mountains."

, he even lost his right eye for this reason. His right eye was given to him by Lord Esther."

"The "Anthology of Flower Spirit Fairy Tales", "Forty-Nine Nights" and "The Beauty of Mathematics" that you are crazy about are all written by him. The lord in "As You Like, Lord" is based on him."

"He is only sixteen years old. He has been a teacher at True Spirit Academy and a tutor to the princess. Now he is the great lord of Sombra City. He single-handedly saved millions of residents who were affected by the disaster in Sombra City, including more than ten

Thousands of our tribesmen. We in the Fairy Forest should also give him the respect he deserves, okay?"

All the goblins present were stunned and motionless on the spot as if struck by lightning.

It's him?

It’s not our fault. Looking at his casual appearance, who would have thought he was a great lord?

A student carefully picked up the painting and was about to run away when Yotsuba asked: "What do you want to do?"

The student said: "Dean, I plan to give it to Miss Liu Xi..."

Siye said with a cold face: "Stop! Turn around and hang it in my office. Also, immediately copy the results of these two questions to Princess Liulian and tell Meiyi to come to the Northern Fairy Forest.
Chapter completed!