My Senpai Knows Magic

Chen Luo looked at the girl blocking the road, with a stiff smile on his face, and said, "Sister Isabella, what a coincidence..."

Isabella looked at him with a bit of resentment on her face, and more of a dissatisfaction. She gritted her teeth and said, "I didn't expect you to be the Blair that Mr. Britney said..."

She has long wanted to know the second-grade student with math talent that Teacher Britney said.

Of course, at that time, she had the idea of ​​comparison in her mind, but for several days, every time she went to his classroom, he was not "by chance". Once or twice, it was a coincidence. Ten times, it must be him. Hiding on purpose.

After investigation, Isabella found out that the Blair that Teacher Britney said was the rude person who bumped into him twice that day, the famous magic waste material of St. Donas College.

Of course, not anymore.

A few days ago, after the news of the magic practice class got out, Blair was known as the fastest man in the entire second grade. In terms of the speed and stability of the fireball technique, even most third graders couldn't match it. he.

However, after knowing Blair's identity, whether he is a math genius or a magic genius, it is not something that Isabella cares about.

This rude person actually covered her mouth when he was chanting the magic spell, and interrupted a magician's spell casting in this way——Is this what people do?

It was also an unforgivable humiliation for a lady.

Thinking of this, the anger that was finally extinguished in her chest was born again.

Chen Luo saw that Isabella's flat chest began to rise and fall, and was worried that she would summon a fireball again. The appearance of a beautiful figure in the distance finally showed him the dawn of hope.

"Mr. Britney!" Chen Luo greeted Teacher Britney from a distance.

"It's Blair, I was just looking for you." Mrs. Britney stepped forward and said with a smile on her face, "I have something to tell you."

Seeing Teacher Britney, Isabella temporarily suppressed the anger in her chest.

Chen Luo has a very good impression of Teacher Britney, not only because of Blair's relationship, but in her, Chen Luo also sees his dedication to mathematics.

Teacher Britney said embarrassedly: "About what you said, if a set of numbers starts from the second item, and the difference between each item and its previous item is equal to the same constant, then their sum can actually be used Described by the same simple formula, I have found this formula and wrote a paper, which has just been selected by the journal, because the appearance of this paper is inspired by you, so this article is jointly signed by us ."

The reason she was embarrassed was that this article was inspired by Blair. Blair had obviously discovered this rule and would soon be able to find out the formula. By doing so, she was suspected of stealing the research results of students.

Isabella's red lips parted slightly, and she looked at Teacher Britney in amazement. She is Britney's student, and of course she knows what co-signature means.

Although this formula is not a major discovery, its thinking is very clever and groundbreaking. It is foreseeable that it will even appear in future textbooks. That is to say, it is very likely that what she learned in the future In textbooks, the Britney-Blair formula will appear…

And since then, all the beginners of mathematics in the Loran Kingdom, and even the Continent of Divine Grace, cannot avoid Blair's name.

Thinking of this, she suddenly had a sour feeling in her heart,

For Chen Luo, it doesn't matter if he signs or not. All he cares about is magic. It would be better to give him some silver coins to sign him a useless paper.

Casting magic is a very mental and physical thing. With two pieces of bread a day, Chen Luo can't get enough to eat. Blair's poor savings can't last for half a month. He came to this world. The biggest problem is actually filling the stomach.

Teacher Britney seemed to have thought of something, handed him a small cloth bag embroidered with flowers, and said, "This is fifty silver coins, a reward from the Mathematical Association, I think it should belong to you..."

Chen Luo's salary as a handyman in the library is food and housing, two silver coins a month, and fifty silver coins. He needs to earn two years and one month.

No wonder Britney said that scholars and magicians are equally respected in this world, not only respected, but also very profitable.

With these fifty silver coins, he won't have to worry about starvation for a long time.

Of course, Chen Luo wouldn't be foolish to refuse. He reached out to the purse with one hand and said politely, "How embarrassing this is, there is at least half of Mr. Britney's credit for this..."

"Then I'll take half of it." Teacher Britney took back the purse, took half of the silver coins from it, and handed the rest to Chen Luo.

"…"

Because of his polite remark, the fifty silver coins were half less, and Chen Luo could not wait to slap himself.

However, it seems that Teacher Britney is not a well-off person, and Chen Luo no longer cares about it. Without her, the papers written by Chen Luo himself would not be valued by the Mathematical Association, and it is very likely that they would not be submitted for review. in human hands.

Even so, Chen Luo still felt a little distressed about the twenty-five silver coins, he thought about it, and suddenly said: "I have been thinking recently, if a group of numbers starts from the second item, the ratio of each item to its previous item If they are equal to the same constant, can their sum, like the previous case, be described by a unified formula?"

The formula for the summation of the arithmetic sequence has come out, and the arithmetic sequence naturally cannot be left behind. After all, this is another fifty silver coins...

Teacher Britney looked at him suddenly and asked, "You mean the mystery of Raus?"

"????" Isabella looked blank: "What mystery?"

Chen Luo spent the past few days in the library, almost finished reading the history of magic, mathematics, science, and nodded, "Yes."

These days, Chen Luo has been surprised to discover that the laws of development of mathematics seem to be unified, whether it is the mystery of Amos in ancient Egypt in another world, or the "going out and looking at the nine embankments" in the ancient Chinese "Sun Tzu Suanjing", Or the "Mystery of Raus" in this world, it's all a matter of proportional sequence.

The description of the mystery of Raus is: Raus has seven wives, and each wife has seven pockets, and each pocket contains seven cats, and each cat has seven children, ask the wife, pocket, big cat, small How many cats are there...

This question seems a bit boring. No one will add these things together. Compared with these undesired things, people may be more concerned about whether Raus's kidneys are good or not, but if you look at it as a purely mathematical problem , there is still a need for research.

As a proportional sequence, Raus's riddle has a small number of items, and one item can be added to get the answer, but what if there are ten, twenty, and fifty items?

If there is a formula that can generalize the sum of arrays with this law, this is another major discovery in mathematics.

Different from the arithmetic sequence, the arithmetic sequence actually appeared earlier, and it corresponds to the famous Rausian riddle. If the Rausian riddle can be solved with a simple formula - the Mathematical Association will not reward one. Hundreds of silver coins are a bit unreasonable, right?

Teacher Britney asked: "You mean, you can use a formula to summarize problems such as the mystery of Raus?"

Chen Luo nodded and said, "There is only a little preliminary progress."

Teacher Britney grabbed his wrist excitedly and said, "Go to my room and talk!"

Seeing Teacher Britney dragging that Chen Luo towards the teacher's dormitory with big strides, Isabella stomped her feet and followed quickly.

…

The derivation of the summation formula of the proportional sequence is very simple, but before modern times, the development of both mathematics and science was very slow, not to mention in this world that pays more attention to magic, mathematics and natural sciences , In Chen Luo's eyes, it can't even be called the budding stage.

Teacher Britney has a good foundation in mathematics. As soon as Chen Luoluo was inspired, she picked up a quill and wrote down a few lines of derivation on the paper.

Looking at the formula she derived, Britney brought in several arrays similar to Raus's puzzle, and came to the same conclusion that she added one by one with addition.

"It's unbelievable, the mystery of Raus is about to be solved by us." Teacher Britney's beautiful eyes shone brightly, looking at Chen Luo and admiring: "Blair, your mathematical talent is unparalleled, you really don't Would you like to study mathematics with me?"

"Gu..."

Chen Luo didn't answer, but his stomach responded.

The last class in the morning was history, and it was time for dinner.

"I almost forgot, you haven't eaten yet." Teacher Britney hurriedly ran into the kitchen, took out two cakes, handed them to Chen Luo and Isabella, and said, "You guys have something to eat first, I Recalculate it a few more times..."

Chen Luo took the cake and finished it in two bites. It was the best thing he had eaten in recent days.

Isabella looked at Britney's teacher who was addicted to mathematics, and knew that this was another great discovery. She had expected that a new "Britney-Blair" formula might come out soon.

Originally, her competitive spirit had driven her to compete with Blair. How could she compete now?

She took a bite of the cake in her hand, only to feel that her favorite dessert in the past was suddenly not so sweet...