The Kyushu world is mathematical, even Arabic numerals and addition, subtraction, multiplication and division equal to greater than less than ...... These common mathematical symbols are available.

This is of course the credit of Zhao Sheng and Wen Chao, until today, the ninety-nine table used when the school is enlightened will be specially marked under the title of the author - Di Jiazi. And there is a book called "Basic Mathematics", and the author's signature is "Wen Chaogong".

"Basic Mathematics" is not an enlightened textbook, but it is available in most official schools - after all, there is nothing wrong with learning some mathematics, and families who have the conditions to let their children go to enlightenment will not want their children to only write and not count.

Pan Long has naturally read this book too, and as far as an entry-level math textbook is concerned, it is quite good. The concepts of addition, subtraction, multiplication and division are explained very clearly, and some basic geometric knowledge such as the Pythagorean theorem, parallel and perpendicular are explained in detail, as well as lower order equations, unknowns and systems of equations, and their practical applications.

This book alone is enough to cultivate talents with basic mathematical concepts and mathematical common sense. In another world, at least he can be regarded as a qualified elementary school student.

However, more advanced mathematics, as well as physics, chemistry, and other related subjects that use mathematics as a tool to study the world, are quite weak in the Kyushu world.

Zhao Sheng and Wen Chao obviously have little attainment in these aspects, Zhao Sheng left a set of fragmentary conjectures and assumptions, and Wen Chao left a lot of science fiction style. If someone follows the path they have proposed, it may indeed open up a new era of science.

...... Unfortunately, a thousand years have passed, and such a person has not appeared.

The wise men of this world are more concerned about the improvement of their own strength and the path to immortality.

Pan Long didn't know if anyone had tried to analyze, sort out, and argue the fragmentary ideas left by Zhao Sheng in the past, but as far as he knew, the sales of that book were very poor, and even except for the Great Xia Imperial Society, which printed 1,800 copies on Taizu's birthday every hundred years, and put them in various libraries or official schools, there was no private printing of it.

Zhao Sheng's last gift to the world was a little bleak when no one cared about it.

Wen Chao's sci-fi is quite popular, and there are often even masters of mechanics and magicians who cooperate to actually produce the things he fantasized about back then.

But their approach does not have even the slightest hint of "science".

When encountering difficulties, it is not necessary to analyze where the problem is, and find a solution through calculation and exploration, but to directly use spells to forcibly crush it.

For example, when Emperor Bingxu ascended the throne, someone once offered a "flying wooden bird" as a gift. At first glance, it looked like an airplane, but in fact, anyone with some knowledge of physics would know that it was a parallel import, and it was not aerodynamically designed at all.

...... The principle of its ability to fly is to lift off with spells.

Of course, spell technology is also technology, but if you don't explore and find the right and efficient way, your mind is full of "you can fly with a big enough thrust and a brick", which is contrary to the road of science.

The "flying bricks of force" in another world is actually a joke, and Soviet-style aircraft still have to follow basic aerodynamics.

But the "flying power bricks" in this world are a fact, and the kind of flying magic weapons that work against aerodynamics abound.

In a world with supernatural powers, before technology has advanced to a certain extent, facing the competitor of spells is like a child fighting an adult, and there is no chance of winning at all.

So Wen Chao's gift didn't work either.

After all, the people of this world have not continued to move forward on the road of natural science.

And now, Pan Long plans to take matters into his own hands and make up for the missing part of the tech tree in this world.

He explained his ideas to the three immortal elders in detail, and made a number of ideas about physics, all of which had been proven in another world.

There may be subtle differences between the two worlds that lead to disagreement in some areas. But there is no doubt that, overall, the general direction should be aligned.

In order to explain and prove those physical principles, he naturally used mathematics as a tool. And as the things he needs to prove become more complex, the mathematical tools he uses naturally become more complex.

In this way, it naturally goes far beyond the scope of primary and even secondary schools.

When the discussion went on to the second day, that is, on the 20th of August, Pan Long finally came up with something that countless people hated in his previous life.

Further Mathematics.

Soon, first of all, Bi Lingkong couldn't help but shout.

"What are you tossing about, why can't I understand at all?"

Pan Long stopped the number series transformation in his hand and looked at the teacher with some confusion - he felt that he wrote quite clearly, step by step, and if he went to the university in his previous life, he might be teased by his classmates, "Where did you come from, do you need to start deducing from the basics?"

But why can't the teacher read it?

Bi Lingkong's face was flushed with his surprised and bewildered eyes, and he simply turned into a crow the size of a palm, spread his wings, and jumped up and down on Pan Long's manuscript paper, shouting as he jumped: "Write something that birds can understand! Even if you can't speak crow, at least you have to speak human language!"

Pan Long had no choice but to put the teacher aside and comfort her for a while before she flew back to her room to rest sullenly.

Then Pan Long, Lie Yukou, and Lan Ling continued to discuss.

After about half an hour, Lie Yukou stood up with a pale face and muttered: "My life has an end, and there is no end to knowledge.

He just muttered, walked to the quiet room next to it, and didn't meditate, just lay on the ground with a grunt, closed his eyes and went to sleep.

Pan Long watched Lie Yukou leave blankly—of course he understood the meaning of that sentence, which was nothing more than saying that "pursuing infinite knowledge with a limited life is a self-defeating way" or something like that.

But...... But...... Lie Yukou seniors, you are an immortal, your life is unlimited!

He sighed helplessly and looked at the last Lan Ling who was sitting here discussing mathematics with him.

Lan Ling's face was calm, his expression was indifferent, and he looked like a fairy wind and bones.

"Sure enough, he is worthy of being a national teacher!" he sincerely admired, "Mr. Lanling is really talented!"

Lan Lingjing smiled slightly: "What you said is very interesting, continue to talk about the analysis just now." ”

Pan Long lowered his head and explained endlessly while writing and drawing on the manuscript.

I don't know how long it took for him to finally explain the application of a complex mathematical problem to physics—a small knowledge mainly used in statistics.

Raising his head contentedly, Pan Long was about to praise Lan Lingqing's profound talent, but he saw Lan Lingqing sitting there with his eyes open, but his eyes had lost their lustre, and he couldn't even see the slightest light.

He was a little surprised, and asked tentatively, "Mr. Lanling?"

There was no answer.

He stretched out his hand and shook it twice in front of Lan Lingqing's eyes, but Lan Lingqing didn't react.

In the end, he couldn't help but push it gently, but Lan Lingqing directly flipped to the ground with a bang, maintained a "sitting" posture, and rolled to the other side of the study while lying on the ground.

Only then did Pan Long understand that the first generation of the Great Xia National Teacher had already fainted, and he just used spells to fix his body before fainting, maintaining the face of a big man.

He looked at the drip in the study, it wasn't even lunch time.

"One morning, just by talking about it, two of the three immortals ran away, and one said he fainted...... If I had been admitted to a graduate school in theoretical physics, wouldn't I have been able to play the magic sound of the soul set? When the time comes, a set of ten volumes of Landau will be laid out, and it will definitely be a man blocking and killing people, and a Buddha will block and kill a Buddha. No matter how much ability you have, a set of processes will give you the whole clear and clear ......"

It's a pity that in his previous life, he was actually at an entry-level level in advanced mathematics and even theoretical physics, and he barely entered this course, not that he didn't know anything. But he's still far from the professional scholars who actually study these things.

Advanced Mathematics and Theoretical Physics in Past Lives...... There is a saying that "only those who can read the papers of five years ago are eligible to participate in scientific research" - and the vast majority of graduate students in the world who study these majors are actually only learning those things that Pan Long did when he was young.

It is said that in the first few years of his travel, theoretical research has developed to the point that except for a few bigwigs in the world, the rest of the people read papers as if they were reading books from heaven......

What Pan Long is writing now is nothing more than the things that science students have to learn in order to graduate successfully, and even the things that are still in the direction of application and pure theory, he has not yet written!

Sighing secretly, he made up his mind that when he became famous in the future, he must publish a set of "Pan Long Ten Volumes" to list the theoretical research things in his memory, so that future generations of scholars can study them well.

...... It's best to let them start to have a headache when they hear the word "Pan Long", how majestic!

The three immortals are worthy of being immortals and long-sighted masters, although they were dizzy by Pan Long's words with high numbers, but after half a day's rest, waiting for the afternoon undeclared turn (around 3 o'clock), they have all recovered.

The first to recover was Lie Yukou, and he didn't know what means this immortal used, he seemed to have forgotten all the things he heard in the morning, and patted Pan Long on the shoulder with a smile, and said, "It's really terrifying! Pan Long, next time we discuss the Tao within the Dao Gate, how about you go to participate for me?"

"I'm not a disciple of the Daomen, it's not suitable, right?"

"As long as you take out this morning's set and get all those bad old men down in one go, that's fine. Lie Yukou's smile was quite treacherous, "Rules can only restrain the weak, as a strong person who can make them lie down and admit defeat with just a mouth and a pen, you don't need to care about what is 'suitable' or 'unsuitable'!"

Bi Lingkong clasped his hands to his chest, squinted his eyes and said, "To put it bluntly, because of his shallow cultivation, he has to suffer a little loss every time he talks about the Tao. Over the years, I don't know how much cynicism I have received. It's rare to meet someone who can help him save face, where do you care if it's a disciple of the Daomen? Anyway, at most, it's just a breakdown and a fight, and they don't talk about the Tao and finally complete the martial arts, it's not once or twice, what does it matter if it's one more time?"

Pan Long looked at Lie Yukou in shock, but saw him touching his head and smiling awkwardly.

Obviously, the teacher is telling the truth.

This shocked Pan Long - he originally thought that when the Daomen immortals talked about the Tao, everyone should be sitting on the futon, and there were all kinds of treasures in one word, such as the golden lotus surging from the sky and the rain...... No, it seems to be a scene of a monk discussing the Tao, and the Taoist priest discussing the Tao should be from the purple qi from the east or something......

Unexpectedly, it turned out that the immortals argued, and in the end, "the weapon of criticism is not as good as the criticism of weapons", using fists instead of mouths to persuade opponents.

Lan Ling sighed: "It's a pity that the three of us have lived for so many years, but we can't even understand what you say...... When the old man and Wen Chao were arguing, he said more than once, 'You have no reverence for knowledge', I always thought he was talking nonsense, but now I understand that it is not that he is hard-mouthed, but that he is kind-hearted, and only talks about things that I can understand......"

(No, I don't think he understands what I'm saying at all, after all, liberal arts don't study high math...... ）

Pan Long complained so much in his heart, but he didn't say it.

"Okay, Pan Long, you better give us some things in the yang world. Bi Lingkong smiled and said, "The ones I talked about yesterday are good, and the ones I talked about this morning are ...... reminds me of the joke that Wen Chao and Zhao Sheng often said back then, 'from entry to soil'...... If you study these things, I'm afraid you'll really study yourself to death!"

Pan Long didn't think that high mathematics would kill people, but when the teacher said so, of course he couldn't refute it.

He thought about it carefully, and thought that it seemed to be okay - anyway, if the research content was limited to the level of classical physics, it would not really require much in-depth knowledge, it was nothing more than simple calculus.

It's not intimidating to think of this kind of thing.

Then, they spent a long time discussing and analyzing, and the final result of the discussion was a thick manuscript.

As for how many times Bi Lingkong rolled around during this discussion, how many times did Lie Yukou pretend to be crazy and sell stupid, and how many times did Lan Lingqing suddenly faint...... It's all trifle, it's all gone anyway.

At the end of September, the book "Preliminary Studies in Mathematics and Physics" was finally completed.

When Pan Long stacked the cover of Bi Lingkong's painting on top of the preface written by Lan Lingqing, announcing the completion of the entire manuscript, the three immortal masters all breathed a long sigh of relief, as if they had unloaded a thousand catties of burden.

"When this book is published, and then it is studied and accepted by the people of the world, your path to immortality should be smoothly opened. Lie Yukou smiled and said, "When the time comes, all you have to do is accumulate cultivation-this short discussion of more than a month, there is actually an immortal Buddha discussed, the old man recalls, it is really a bit like a dream!"

"There may not be only one immortal Buddha. Pan Long smiled and pointed to the teacher's room.

Bi Lingkong had been in retreat since a few days ago, and at this moment, there was a mysterious aura vibrating in her room from time to time, and it was gradually coming to a critical moment.

Perhaps, before Pan Long, she relied on the path of mathematics to achieve immortal Buddha.