Number theory, or mathematical theory, is a name that only emerged in the twentieth century.

Before that, people usually referred to this branch of pure mathematics that specifically studies integers (defining integers) as "arithmetic," and because of its fundamental position in mathematical principles, it was often called the "Queen of Mathematics."

In fact, even in the latter half of the twentieth century where Aileen and the others currently are, the study of "arithmetic" in mathematical theory still holds significant importance, mainly due to the influence of the French mathematical community—the most powerful and thriving mathematical kingdom in the field of modern mathematical theory.

This mathematical prowess is not only reflected in the number of mathematical geniuses, but more so in the everyday foundation and atmosphere.

Compared to other countries in the world, French does not use a decimal logic when expressing numbers. Basic counting in French uses a base-20 system. For example, 99 is expressed as 4*20+10+9.

And after mobile phones began to become popular, this became a nightmare for all foreign tourists attempting a romantic trip in France.

In France, French people don't read phone numbers one digit at a time like other countries.

For example, instead of reading 6-5-9-7-8-3-7-6, they read it in pairs as 65-97-83-80.

Which sounds like: 60+5, 4x20+10+9, 4x20+3, 60+16.

Furthermore, if we were to talk about the difficulty of exam-oriented education systems in the field of mathematics alone, the Chinese "Gaokao" (National College Entrance Examination) might only rank second.

As the most difficult and rigorous exam-oriented education system in the world, French students who want to enter university must work very hard in the two (or three) years of high school to learn the techniques of calculus and linear algebra in order to cope with the world's most difficult "Gaokao."

If converted into Chinese mathematics textbooks, it is not simply the level of senior high school, but the level of sophomore year of college.

However, starting this year, French secondary school mathematics is no longer the only "most wonderful" exam-oriented education content.

At Hogwarts Castle in the Scottish Highlands, the same content is appearing in the wizards' classrooms.

"Professor Alexei, sorry, I have a question..."

Aileen glanced at the little wizards around her, and before the confusion on their faces could reappear, she actively raised her hand.

"Why do we need to learn French? If it's just learning the four arithmetic operations, we also learned some simple addition, subtraction, multiplication, and division in astronomy class. I saw calculus in the textbook, but I heard that England is the origin of calculus, right?"

"Oh, yes, that is indeed a good question—it seems that Miss Caslana has prepared very well."

Alexei's eyebrows twitched slightly, he glanced at the lesson plan on the desk, and quickly replied.

"When you all study mathematics for a certain period of time, and slowly advance along the long river of mathematical history, coming to around the sixteenth and seventeenth centuries, you will find that in that era of geniuses, France was almost the modern mathematics."

"Isaac Newton was indeed a remarkable scholar, he contributed to calculus, but he also blocked the scientific development of England for nearly a hundred years. And after him, Vieta, Mersenne, Descartes, Fermat, Pascal, d'Alembert, Lagrange, Poisson, Fourier, Laplace, Cauchy..."

"Of course, these names may still sound a little unfamiliar to you now, but as the course progresses, you will know that they are almost the most famous scholars in the field of mathematical theory in the next hundred years, and they—are all French."

Alexei moved his gaze away from the lesson plan, and the words in his mouth became more and more fluent, his face full of emotion.

"In any field, if you want to master the most core and complete knowledge, then learning through the native language of the knowledge discoverer is undoubtedly the most effective. This is also why the wizards of the British magical world are inherently more powerful than foreign wizards... Spell books and potionology are all written in English."

"What's more..."

The middle-aged man changed the subject, and suddenly winked at the little wizards.

"French, it is one of the most romantic languages in the world. I heard Professor Dumbledore say that Hogwarts will launch an inter-school exchange with a certain magic school in France next year, whether it is applying for an exchange student or making friends with gentlemen and ladies from French magic schools, mastering a fluent French is one of the essential prerequisites."

"A French magic school?! Really? Professor, do you mean Beauxbatons Academy of Magic?!"

Aileen opened her eyes wide in surprise and said quickly.

And behind her, the little wizards in the entire classroom began to talk to each other. Draco Malfoy introduced this romantic magic school full of "handsome men and beautiful women" to the surrounding little wizards in a rather mysterious way.

As for the source of information, it naturally came from his all-knowing father, a member of the Hogwarts Board of Governors.

"Oh, the specific situation cannot be revealed to you for the time being..."

Alexei scratched his nose somewhat embarrassedly, and gently sorted out the lecture notes he had finished reading in front of him.

In Aileen's satisfied eyes, Alexei mysteriously added a final sentence.

"But I can swear that this is definitely a major project that will be finalized in the next year or two. When the Ministry of Magic and Professor Dumbledore think the time is right, they should notify you. Now let's turn our attention back to the course..."

"A big project, could it be... Oh, I understand—"

Aileen nodded obediently, sat down, and took the initiative to open the textbook to prepare for listening to the class.

And with the girl's actions, the sound of discussion in the classroom gradually subsided, and the students also suppressed the curiosity and confusion that was constantly surging in their hearts, cheered up, and looked at Mr. Alexei in front of the classroom with anticipation.

From any point of view, compared to the boring numerical calculations and formula theorems, learning a romantic language located in a country next to the United Kingdom obviously sounds more interesting—at least for now, the little wizards think so.

Not to mention, just now this professor seemed to have revealed some amazing information.

Accompanied by the little wizards' halting French pronunciation, a wonderful door to mathematics was opened.

……

At the same time, in an empty classroom next to the mathematics classroom.

"...It seems that the first class is progressing quite smoothly, and we shouldn't need to save the day."

Dumbledore breathed a slight sigh of relief, turned his head and glanced at Professor "Apocalypse" sitting beside him. On the table in front of him was an identical copy of the math textbook, and he said in a low voice with a bit of restrained laughter in his tone.

"Speaking of which, Gellert, your terrible French really should be practiced. This can be regarded as making up for your past shortcomings."

"If it weren't for that bet, I wouldn't—"

Hearing Dumbledore's teasing, Grindelwald couldn't help but twitch the corner of his eye again, and looked at the stack of "Hogwarts Grades 1-7" math textbooks placed on the long table in front of him, and instantly felt his head ache a bit more.

As punishment for giving up the "SSS" commission from those Muggle lunatics, he had to complete a requirement from Aileen.

What the first generation Dark Lord did not expect was that the condition proposed by this little witch was—to have him attend math class with the little guys at Hogwarts, and complete all the course arrangements and homework for grades 1-7!

"I hate Paris, I hate French—"

Grindelwald shook his head and took a deep breath.

If he had known that this would happen, he should have hardened his heart when convening the gathering in Paris, and burned the entire city full of sinful numbers and devilish knowledge in one go, instead of redoing his schooling here.

"You are really too indulgent of Aileen, Gellert... I thought you would reject her request."

Dumbledore's blue eyes flickered slightly, and he said meaningfully in a low voice.

"Unexpectedly, in all of Hogwarts, you are the one who supports her education reform the most. You even took the initiative to endorse the child's ideas, which really surprised me a bit—if I'm not mistaken, even if she hadn't made this request, you would probably have learned the relevant Muggle knowledge on your own, right? What exactly are you thinking, Gellert?"

"It's just completing the task of that little devil, don't think too much, Albus."

Grindelwald replied without changing his expression, calmly looking at the stack of materials piled up on the long table next to him.

"Aren't you also learning these headache-inducing knowledge? The dignified Headmaster of Hogwarts School of Witchcraft and Wizardry, the greatest wizard in the magic world today, would actually be reduced to secretly coming over to attend student classes—"

"Times have changed, old friend, I'm not an insincere guy like you."

Dumbledore shook his head with emotion, his slender fingers tapping lightly on the stack of textbooks in front of him.

Centuries ago, wizards used wands and cast magic, but they could still effortlessly understand what Muggle knights' armor and broadswords were, and they could also understand what Muggle star charts were drawing.

However, in this era, wizards are still using traditional wands, using owls as messengers, and traveling between fireplaces, but they are completely unable to understand what Muggle phones and computers are. Most of the functions of the "Hyperion" flying above Hogwarts are extremely unfamiliar to Dumbledore.

There is no doubt that recruiting students from the non-magical world can allow wizards to learn how to use these industrial products.

But if it's just like this, it will never allow the wizards living in the magical world to understand the principles and knowledge hidden behind those little things, just as Muggles can never understand the true meaning of the Patronus Charm.

"As a wizard, mastering simple mathematical calculations and language skills is indeed not difficult..."

Dumbledore listened to the sound of reading coming from the classroom next door, and a smile appeared on his old face.

"However, if the magical world wants to truly understand and understand the foundation of the power of 'science', then we need to catch up and make up for too much—it is difficult for our generation to change, but these children still have the opportunity to catch up with the train to the new world. Even if it is a little hard, it is better than being abandoned by the world in the future..."

"This is also... the meaning of Hogwarts School of Witchcraft and Wizardry."

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Well~ I'll post a picture in about a week or half a month~ Thank you all for your blessings~ So touched~~~