Lan Ruochan

Chapter 334

Qingyun didn't want to cause embarrassment when they met for the first time, so he urged the Xu brothers to invite him back.

As long as you say some small things, clever words to appease, it won't be a big deal in the future.

The truth was simpler than he had imagined, Mrs. Xu was just adding to her chest, in order to prevent herself from losing her composure, she avoided it a little.

He turned around in the cave, calmed down, and felt that Cai's behavior was a bit abrupt, so he took the initiative to return to the front cave.

In order to find a topic to ease the atmosphere, he deliberately brought some local products unique to Changbai from the ice cellar in the back cave.

"Hey, on the top of the Great White Mountain, where the mountains and the sea are at the end, material resources are scarce.

Several distinguished guests came from afar, and there was nothing to entertain them.

Some wild fruits in tea soup, chatting to comfort the wind and dust, don't laugh at it. "

There is a groove on the rock wall of the front cave. It seems that because it is closer to the molten core, the rock in the groove has its own high temperature.

If the water jar is placed on it, it can always boil.

Mrs. Xu put the frozen fruit near the stone trough, and took out the water jug ​​to make a few cups of tea soup, and the stone room was filled with fragrance.

In Baishan property, the Xu family brothers and Jin Zha naturally had seen the world, but they couldn't help but exclaimed when they saw the tea presented by Mrs. Xu.

"Ah, this is the legendary Yuntian Ginseng Velvet Soup!
Among them, the materials used are rare, and the national teacher has spent a lot of money this time. "

Li Daoyuan heard what Xu's younger brother said, and hurriedly took the words to the heat,
"Oh? I don't know what's so rare about it?"

"The so-called Yun, Tian, ​​Ginseng, Velvet, and Bulaotang refer to five kinds of health-preserving herbs that are very rare outside of Baishan.

Yun refers to Yunzhi; Tian refers to Rhodiola rosea;

These five kinds of medicinal materials are all worth a thousand gold in the pass, but they happen to be produced in this Baishan Mountain.

So if you go out of Baishan, this Yuntian ginseng and not old soup can definitely be called a world-class delicacy. "

Before the younger brother finished speaking, the older brother added,

"It's not just this tea soup. The strange fruit brought by the national teacher should not be underestimated.

This fruit is called Hawthorn Begonia, and its taste is between that of Hawthorn and Naiguo. Eating it promotes body fluid and invigorates Qi, and instantly quenches hunger and thirst.

It is impossible to see it outside Baishan.

Due to the remoteness of Baishan Mountain and the inconvenient transportation, this fresh fruit cannot be brought to the Central Plains. "

As soon as they started talking about exotic foods, everyone started chatting one after another, and the embarrassing atmosphere just now naturally disappeared.

Qingyun also took the opportunity to interject a few words, and then changed the subject and returned to the layout of the cave.
"The layout here is very ingenious, which is rare in the world.

Although I can roughly guess some ingenuity, there are still many places that I can't understand.

For example, the outdoors are full of smoke and dust, full of sulfur smell, but in this grotto, the air can still be kept fresh without any pungent smell.

National teacher, what is the reason for this? "

When Qingyun asked Mrs. Xu for advice on something she didn't understand, she naturally stepped down the stairs. Before, a brat like himself could see through the elaborate arrangement of others, which was indeed a bit embarrassing.

And the questions he chooses are indeed the doubts in his heart that need to be solved, so there is no artificiality at all.

Mrs. Xu grinned, obviously quite proud:
"Hey, everyone in the world says that Tao Huayang knows everything, and Zu Wenyuan's construction is miraculous.

But when it comes to the method of filtering the wind and suffocating the qi, it is not Xu who claims that there should be no two people in this world.

This is Xu's accumulated experience in digging caves and building houses in places with heavy smog for decades.

In fact, it is not very magical. First of all, it is necessary to interpret the wind direction and build ventilation holes. As long as Hou Tian knows the geography, it is not difficult.

The second is to find suitable materials to absorb the dust and impurities between the vitality of the heavens and the earth.

Over the years, I have compared many materials, and found that the burnt wood section that was instantly ignited during the volcanic eruption is the best material for absorbing dust.

Every time the Nuo master was furious, after the smoke cleared, the air in Baishan was still able to recover quickly, thanks to the burnt wood.

So I collected many of these burnt woods to make gates, and arranged them layer by layer among the air openings and passages.

After several times of filtration, the air in the grotto is naturally fresh, and it also has a hint of the smell of the forest. "

Hearing the words, Qingyun took a deep breath, closed his eyes and nodded in agreement.

Mrs. Xu smiled slightly, and found a way to make up for her gaffe just now:
"I heard that there is a smelting one. In the Central Plains, there is a saying that Hua, Xu, Erqi, three in a row, four in a row.

That's probably because Xu hasn't set foot in the Central Plains for too long.

You have caught up with a good day this time, and you can witness the Nuo master dance the hammer and forge the sword together.

A certain sword was cast by the king of Wei, using Xianbei nine-day black iron, and it cannot be made without the real fire of samadhi.

Therefore, the last process of casting can only be completed by the Nuo master himself.

The Divine Sword is in the Molten Heart at this moment, and when the Nuo Master dies in a few days, the Divine Sword will be born.

When this sword returns to the Central Plains, I am afraid that Hua Yi and Xu Er's statement should be changed.

This is not Xu's conceit. At that time, I will invite Tangun to test the quality of this sword first.

After all, whose family is one foot taller, we still use the finished product to speak. "

Although Qingyun couldn't fully agree with Mrs. Xu's fanciful self-confidence, but he also knew the etiquette of being a guest, so naturally he wouldn't argue too much at this time.

After a few quick answers, he asked Mrs. Xu about another important matter.

Qingyun pointed to the unconscious Nuo Zha and said,
"National teacher, there is one more thing I want to ask you for advice, kid.

I have a friend who is suffering from cold poison and needs to be healed by the sun.

I think there must be a suitable place near the Molten Core, and I need more guidance from the national teacher. "

Mrs. Xu's face changed when she heard the words!

"Cold poison! Let me see!"

He checked Nuo Zha's pulse carefully, and exclaimed,
"It turned out to be that old monster Beihai Caodou!
In his capacity, it was inconceivable that he would attack a child. "

"Hey? The national teacher recognizes the old monster of Beihai?"

Qingyun briefly introduced Li Nuozha's background by the way.

Although there is some distance between Chentang and Baishan, Mrs. Xu has heard about it.

He sighed, and stretched the front of his shirt with both hands, under his left collarbone, there was a black and blue palmprint clearly printed on his heart.

"Hmph! That old ghost!

When I entered the mountain, I ran into his apprentice, Jian Jing, and had some conflicts.

This old monster defended his shortcomings, and even chased Baishan to ask me for an explanation.

I was hit by his palm, the cold poison invaded my body, and I almost died.

It was not easy to hide on the top of Dabai Mountain, relying on the yang energy of the Molten Heart to survive.

I can't leave here these years. The mission of casting swords is important, but this hidden disease is the real reason that binds me here.

I heard that the Xuanming zhenqi of that old monster is extremely sinister and evil, and there is no cure for it.

Fortunately, you asked the right person today, there is a stone room in Tongyou Grotto, its Qi is extremely positive.

Spend an hour in the morning and evening every day to warm and nourish, and you can save your life.

Since this child was also injured by Xuan Ming Jin, he might not be able to go anywhere else.

It's better to stay here to accompany the old man and make a companion for each other.

The most important thing is that I don't want to end the inheritance of my art..."

"""""Knock on the blackboard time"""""

Before experiencing one of the most powerful volcanic eruptions on the earth in 2000 years-the Five Dynasties Changbai Mountain eruption, the geography of Changbai Mountain is obviously very different from what it is now.The real Changbai Mountain Tianchi has not yet appeared, and the Laichi in this article is at best a small part of the later Tianchi.At that time, Changbai Mountain was an active volcano, dormant most of the time, with exposed craters, and often erupted in a small area.

Regarding the principle of small hole imaging, Mozi has actually done a very in-depth research, and has given his own practice and views on distance, size, and proportion.Regarding this point, you can take a look at "Modern Interpretation of Mozi's Theory" written by Professor Xu Xiyan. This book quotes classics and draws pictures to restore some of Mozi's main research.The method of transferring images mentioned in the article can definitely be realized by relying on the principles of Mohism.

Professor Xu Xiyan's restoration of Mohism and the West's restoration of "Elements of Geometry" are actually exactly the same in nature.As I mentioned in the post-article before, there is no original version of geometry, only modern academic books reorganized in modern standard language.Regarding this point, many readers have sent me private messages to express their disagreement.

In fact, the Western historians are relatively transparent about the birth history of "Elementary Geometry". "Elements of Geometry" was originally called Euclid's Elements, which is Euclid's essential technique, and its nature is no different from "Zhoubi Suanjing" and "Nine Chapters of Mathematical Sciences".It is actually Euclid's compilation of some propositions and calculation examples.According to Proclus (Proclus 412-485): Euclid summarized many theories of Eudoxus (Eudoxus of Cnidus), perfected the theory of Theaetetus of Athens, and then Some less rigorous proofs given by people give more airtight proof examples. (Refer to Wiki entry: Euclid's Elements reference)

Therefore, the first two volumes of "Elements of Geometry" are considered to be the research of Pythagoras (Pythagoras), the third volume is the research of Hippocrates of Chios, the originator of Western medicine, four, five, six, eleven , twelve volumes are the studies of Eudoxus.Although the other volumes (thirteen volumes in total) cannot be clearly defined, the achievements of Theaetetus (the father of irrational numbers) are certainly not missing.Of course, there must be some propositions put forward by Euclid himself.In short, this is a compilation of examples.

How rigorous is this sample compilation?Let us give an example first, that is the famous Pythagorean theorem, known in the West as the Pythagorean theorem, which was first seen in "Elements of Geometry".Proclus believed that Euclid had extended on the basis of Pythagoras, and gave an impeccable proof in the original Chapter 6.

This so-called "impeccable" proof must be based on several auxiliary theorems - the triangle theorem with congruent sides, angles and sides, and the correlation theorem between the areas of triangles and rectangles.At the time, it was clear that the congruent triangle theorem was not fully proved.That is to say, the proof of the Pythagorean theorem in "Elements of Geometry" is open and not invulnerable.Although based on modern mathematical cognition, this cumbersome way of proof is indeed feasible.

Compared with Zhao Shuang's "Pythagorean Circle and Square Map" at the end of the Eastern Han Dynasty in China, the latter is a concise and rigorous proof that can be used for teaching today.Liu Hui's "Green Vermilion Entrance and Exit Picture" is also a perfect logical closed loop, but it is not as easy to understand as Zhao Shuang's proof method.

The book "Elements of Geometry" was translated into Byzantine around 760 AD, and was translated into Arabic by Harun al Rashid, the No. To spread. Around 20, the "Elements of Geometry" had been lost in Western Europe, so the British mathematician Adelard of Bath translated it from the Arabic version into Latin.It was not until 1120 that the Latin version of "Elementary Geometry" was finalized and published.The final English version explicitly mentions that it was rewritten by Sir Henry Billingsley.Of the earliest Greek manuscripts, only fragments remain, and the differences between different manuscripts are so great that what is said is no longer expressive.

The illustrated version of "Elements of Geometry" that we can see so far is the product of continuous modification and improvement by wise men for nearly 2000 years, not the original of Euclid.By the way, I would like to share with you that the first person to introduce "Elements of Geometry" to China was not Xu Guangqi in the Ming Dynasty, but the Persian Jamaldin in the Yuan Dynasty.He was an aide of Kublai Khan, who revised the Islamic calendar and supervised the production of national geographical maps.He introduced the Arabic version of "Elements of Geometry" and named it "Four-Broth Algorithm Segments".The book made little impact.And Xu Guangqi's translation of "Original" from Adelaide's version is simply another book.This clearly demonstrates how the content of this book has grown along with the development of modern mathematics in the West.His aura does not come from the original "original".

Many "scholars" believe that the way of studying mathematics in "Elements of Geometry" is more scientific than that of Chinese classics, and has many defining contents.For example, concepts such as parallel lines, points, and straight lines are defined.

First of all, let's not study whether these concepts come from the "original" definition, but at least in modern Latin and English versions, the translators directly use modern mathematical vocabulary to make the expression more accurate.

Why do Chinese mathematics classics lack similar definitions?This is actually because the maturity of the language system is different.

For example, regarding the matter of parallel lines, it is very difficult to read the parallel meaning from the word parallel in English. You must have enough descriptions to empower the word.However, in measurement books such as "Sea Island Mathematical Classics", a large number of concepts of parallel and vertical are mentioned, and they are directly expressed by keywords such as "alignment", "flat", and "straight", and can be drawn as graphics without too many annotations.

In the same way, in Chinese mathematics books, concepts such as power and square root are directly used without definitions.For example: Zhao Shuang, "The Pythagorean shares are multiplied separately, and they are combined to form the real string, and the prescription is divided to form the string." Hook, stock, string, these terms are not defined separately.In fact, it is not necessary.This is determined by the sexual nature of Chinese.The thigh is the upper segment of the leg, or the long (big) segment of the two segments.A hook is a bent section.The hypotenuse is the string.The Chinese language directly defines the long side, short side and hypotenuse, which is not defined in the "Elements of Geometry", and even modern Western mathematics does not subdivide the concept of Pythagorean.

The word root is also very vivid, which is to use the area of ​​a square to disassemble and calculate the side length.Chinese calculations had a very scientific square root algorithm in the Han Dynasty. As long as you have patience, you can calculate any number after the decimal point.

The Chinese school of thought thinks that explaining interpretations and explaining puzzles, explaining terms and explaining these things are separate from solving problems in arithmetic books.Notes will only be added when explaining some terms that are difficult for ordinary people to understand, such as the definition of Fen (acceleration) in "Mozi" quoted in this article.

Chinese is born with one more dimension, and most professional terms can be directly understood. This is also the main reason why Chinese science was too confident in the early days and lacked more in-depth and rigorous definitions.

In this section, Mrs. Xu used to purify the air, and the burnt charred wood is actually activated carbon.The raw materials of Yuntian ginseng and immortal soup and hawthorn and crabapple are also real Baishan species.Among them, hawthorn and crabapple are unique to Changbai, but it is actually a dwarf apple (Ni fruit).This fruit is rich in vitamin C and has a tart taste, making it a good choice for a quick energy boost.

(End of this chapter)