Chapter 72

On the third floor of the teaching tower, in classroom 301, Lena is sitting on a chair. He has several drawings on hand. The sunlight hits his side face through the window, showing a sense of concentration.

Claire sat a little farther away. She didn't know why Lena wanted to come here. Although she heard that it was to assist in experiments, it was just an ordinary classroom. It was usually used to teach courses such as the history of magic. Where could there be room for experiments?

What's more, Lena just got the gold cup of Hohenheim. Is there anything new?

With many questions in her arms, Claire saw a girl looking inside timidly at the door of the classroom and hesitated to step into the classroom.

"Dana?"

Claire recognized the student, Dana Christine, whom Lena mentioned yesterday.

"Well, Miss Claire."

Dana, who was called by name, came in cautiously. She looked at Claire, then at Lena, and then said in a soft voice.

"I'm just coming to see if there's anything wrong and I'll leave right away."

"It doesn't matter."

Lena wasn't surprised because he knew Dana would come.

"Now that we are all here, let's start today's agenda."

Clapping hands, he came to the platform, facing the two people sitting down, it seems that Lena is the teacher.

"Wait, you haven't said what you're going to do today?"

Asked Clare, raising her hand, with some complaint, for it seemed Dana knew something.

"Well, I'd like to improve the spell model a little bit. To be exact, it's the way to interpret the spell model."

Lena said lightly, then turned around and began to draw something on the blackboard with chalk.

But his words stunned Claire and Dana.

Improved spell model???

Now the applied magic models have been determined through countless practices, and they have reached perfection. But Lena said casually that he wanted to improve the magic model?

If it wasn't for the hornheim gold cup he had won before, Claire would have felt that Lena was playing a trick on himself.

Dana was silent. She watched as Lena drew a familiar pattern on the blackboard. It was a magic model of light.

The zero ring spell is built on a plane. All the spell nodes are on the same plane. It's quite simple.

The basic model of this spell is composed of five magic nodes and seven magic channels connected with them. There are three curves and four straight lines in the magic channel, which seems to have no rules to follow.

Seeing this magic model, Dana nibbles her lower lip and pinches the corners of her clothes tightly. It seems that she has bad memories.

This is the spell she failed to cast yesterday.

"This spell model is a model of illumination. The deviation between the relative position of nodes and the magic channel will lead to the failure of casting. Of course, the lack of magic will also lead to similar failures."

Lena has checked Dana's magic test documents, and her magic is not insufficient, but more than ordinary people. Therefore, the main reason for the failure of casting should be her mistakes in building a magic model.

"Dana, I want to ask you how to build a magic model?"

Dana hesitated for a moment when she heard Lena's question.

"First, build the Loire rectangular coordinate system, calculate the coordinates of each node, and then establish the functional equation of the Magic Channel..."

the Loire rectangular coordinate system she said was proposed by the late master of the law system, sir Andre Loire, two hundred years ago. It is a mathematical tool used to describe the magic model, which is similar to that on the earth. On the plane, it's easy to use A coordinate system consists of two mutually perpendicular axes, so it is called a rectangular coordinate system.

On the plane, such a coordinate system can clearly mark the position of each magic node, which is accurate and practical. By changing the position of the coordinate origin, it can also adapt to different situations.

"Is that so?"

After listening to Dana's words, Lena established coordinates on the magic model and marked the positions of each magic node.

Then, he began to write the functional equation of magic channel, which was also proposed by Sir Andre Loire. It is a mathematical expression describing the correlation between one variable and another. Previously, Lena and Antoine used a functional equation to set up magic signature.

However, compared with the magic node, the function equation of the magic channel of illumination is obviously much more complex. Due to the existence of curves, the expression is very cumbersome, and the amount of calculation is also very large.

Dana was embarrassed to see the familiar formula, but she still nodded.

Claire still didn't know why, but she had some previous experience. She restrained her doubts and didn't speak rashly to avoid being slapped in the face by Lena. She listened attentively to Lena's lecture.

"Dana, I think a large part of the reason why you failed to cast a spell is that you had a problem building a spell model. I have a test paper here. I hope you can spend half an hour to do it well."Lena pulls out a handwritten test paper and hands it to Dana.

The student took the paper and soon turned pale.

Because it's all math.

From basic operations to complex solutions to functional equations, there are ten questions on this paper, roughly equivalent to the level of high school students on earth.

Dana glanced at Lena, with a look of resentment in her eyes.

Nevertheless, she still picked up the quill on the table and began to work on the topic.

"So now we're waiting for her to finish?"

Claire whispered. Lena shrugged and handed Claire a piece of paper.

"Why don't you do it?"

it's as like as two peas Danner.

"Well, I won't be fooled."

The same trick won't work twice. Naturally, Claire is not afraid of Lena's provocation.

But curiosity still prompted her to look at the questions on the paper. When she saw the first question, Claire's face turned black.

In the triangle ABC, given AB = 2, AC = 3, angle a = 60 degrees, find the length of BC and the value of sin2c.

"..."

"it doesn't matter. It's not shameful if you can't do it."

Lena said with a smile, this kind of problem is quite difficult for students like Dana, but the calculation of geometric relations on the plane is also necessary for mages to build magic models.

"Well, don't look down on me!"

Claire glanced at Lena, then picked up the quill and began to draft, but it was obvious that she was much faster than Dana.

Half an hour passed quickly, and both handed in their papers.

Although Claire has many mistakes and some topics that she can't write, she is still up to the standard.

As for Dana, there is no right answer to any question, which makes her a little frustrated.

"I'm not fit to be a wizard."

Dana murmured to herself.

"No, Dana, you just lack some basic training and more suitable methods."

Lena's words made the depressed student slowly raise his head.

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