Chapter 734: Top Mathematician

The "original diagram of the opening method", that is, the binomial expansion coefficient table with exponents as positive integers, the so-called "Yang Hui Triangle" in later generations, is also the initiator, and it is this gong.

This is a rigorous algorithm system and ideological system, which has made great contributions to the abstraction, programming, and mechanization of mathematical algorithms, and is a breakthrough in science and engineering methodology.

After Su You got up, he shook his head and sighed: "Jia Gong, Jia Gong, your 1860687 cubic solution, but it is difficult for me and my little sister to die." ”

Jia Xianle stroked his beard: "I have a lot of talents in the Song Dynasty, and the old man was shocked to hear that the young girl in Meishan was able to use a simple and easy-to-understand expression to repeat the old man's solution, which is really shocking!" The old man's personal disciples have all heard the things covered by clouds and mountains, but the despised children of Xishu will know? ”

So the old man found your writings and looked at them, hehehe, yes, yes! Not only Shao Guangzhang's question will be solved, but all the questions will be met! ”

"It's amazing not only to know the solution, but also to know why the solution is the way it is. Do you know how happy the old man was at that time? This is a confidant, a confidant who forgets his years! Hahaha......"

An old man on the side nodded: "The method of fine grass has really helped us a lot, and it is really difficult to express our knowledge in everyday language." With the fine grass, it is clear at a glance! ”

Now Su Xiaomei and Su You are also important contributors to the mathematical community, and their set of algorithm annotation methods of character culture were given a nice name by the Song people - fine grass.

With fine grass, the idea of solving problems can be gradual and gradual, so that learners can accept the dissemination of mathematical knowledge in a systematic and standardized manner.

It is also the content of deductive logic, an abstract analysis of the mind as a tool for procedures, processes, and steps.

Zhao Zongyou hurriedly introduced: "This is Zhu Ji Zhu Gong, the younger brother of Jia Gong, they studied under the late arithmetic master Chu Yan, the two are equally famous academically, Zhu Gong's research on equations and irrational numbers is quite profound. ”

Zhu Ji waved his hand: "Now the old man can be described as a corpse vegetarian meal, and he is ashamed to translate the writings of the master all day, and he is ashamed of the offering money of Sitong." ”

Su You hurriedly explained: "Where and where, these advanced knowledge, in mechanics, physics, algebra, statistics, geography, mechanics, astronomy, optics, all have guiding significance, just a net money volume prediction, to the Great Song Dynasty inexhaustible benefits." ”

Zhao Zongyou then introduced the third place: "This is Liu Yi, my senior brother, in addition to receiving the teachings of Jia Gong and Zhu Gong, he has a very in-depth study of geographical mapping and plane geometry. ”

Liu Yi arched his hand: "This is thanks to Shaobao's research." ”

Su You was a little scared: "What's the matter with me?" ”

Liu Yi admired inexplicably: "With Shaobao's system of equations and the definition of latitude and longitude, the solution set of equations can be described as a line on a plane, this line can be a straight line, and this line can be expressed by a primary equation; But I found that more complex curves, circles, ellipses, can be expressed by quadratic equations......"

Su You was stupid: "Plane analytic geometry? ”

Liu Yi's eyes lit up: "This name is good!" It turns out that Shaobao has already been studied? Presumably, the relationship between the focal triangle and the ellipse formula has been deduced? This involves an algorithm between cartography and formulas, and the area and perimeter can be calculated, as well as the relationship between the area of the triangle formed by the focal point and any point on the ellipse and the angle of the fixed point......"

Su You was so frightened that he waved his hand again and again: "No, no, I just said casually, academics are abandoned by me." You have to ask Xiaomei and Jingrun this question, and they will give you a reasonable explanation......"

Liu Yi is still unfinished: "Shaobao, this problem is worth studying, there is an error in the sun, moon and five-star level provided by the Heavenly Master Dao in Si Tianjian, I have calculated and found that if those perfect circles are changed to ellipses, it is more consistent with observations......"

Damn, planetary trajectory! Forget that these gangs are all from Si Tianjian!

Since everything has been said here, Su You grabbed a piece of paper: "They are all big experts, everyone knows the plane Cartesian coordinate system, and the trigonometric function must have been understood by everyone." I have an idea, pure thought, since Liu Gongdu is already paying attention to the study of curve trajectories, it must be inspired by celestial observations, right? ”

Liu Yi nodded: "Yes, it is mainly used to calculate the astral period." ”

Su You's compass made a circle on the map: "In this case, then we might as well simplify this system, assuming that the origin of observation is the pole, and deriving a ray as the polar axis, then any point on the plane can be expressed as the distance from the point to the pole and the angular relationship between the line and the polar axis." ”

"Taking the five-star plane of the sun and moon as an example, it is completely advantageous to convert the position of each star into such angular coordinates and find out their operation rules. For example......"

Liu Yi grabbed the pencil: "For example, under any polar angle, at any point on the circumference, the distance from the center of the pole circle to the pole is equal to the radius, so the perfect circle equation has the simplest description under this system, that is, the circumference of the pole diameter does not change with the polar angle." ”

Su You nodded: "In navigation, mechanical circular motion, and astral motion, the relationship between two points is studied, and many times ...... I guess...... The coordinate system expressed by this set of angles and distances is more concise and convenient. So this problem, please ask Liu Gong to study it. ”

Liu Yixi scratched his ears and cheeks: "This is the avenue, why don't you study Mingrun?" ”

Su You smiled: "I really don't have this time, I have too many things to do......"

After speaking, he hurriedly expressed his attention: "But I have already asked Your Majesty to build an observatory for you on Zhongshan Mountain in Jiangning Mansion that is the same as Si Tianjian." However, now we have to delay a few people, first of all, the statistical relationship between the amount of water flowing into the Taihu Lake and the reclaimable area around the lake; and the statistical relationship between the economic growth of the two Zhejiang roads, the salt production and the net monetary input......"

After that, Su You inspected the copper smelter, the coking plant, the chemical plant and the cement plant prepared by three acids and two alkalis.

There is salt, there is seaweed, there is sulfate ore, there is coal, these have been mature under the rule of Su You.

The early cylinder tower method has been eliminated, Zhejiang has abundant lead-zinc ore reserves, and now the Hangzhou chemical plant directly uses the lead chamber method to prepare sulfuric acid; Dry distillation of coal or animal bones to prepare ammonia; Preparation of nitric acid by ammonia platinum catalysis; Preparation of hydrochloric acid and soda ash from sulfuric acid, limestone, coal. Caustic mud for caustic soda and cement is prepared from soda ash and lime.

Then the ammonia plant and the alkali plant were unified in production, and the soda ash industry and nitrogen fertilizer industry were vigorously developed through the Hou's alkali production method in later generations.

The downstream industries of these things are metallurgy, textiles, washing, papermaking, ceramics, glass, explosives, cement and other industries are booming......

After the general harvest of the first season of rice in Liangzhejiang Road, the typhoon finally brought abundant rain to Liangzhejiang Road, and the campaign of rushing to plant and save the famine after the drought was vigorously launched in the area south of Taihu Lake on Liangzhejiang Road.

This is the location, you can still sow in June, and you can harvest in October, Hachiko must know that he will definitely cry!

Lu Jiawen also cried, and the 70,000 water conservancy army in his hand all went home happily to farm in a blink of an eye!

This situation is absolutely intolerable, the upper reaches of Taihu Lake are only preliminarily completed and can be put into practice, but the embankment is reinforced, the entrance of the port is reinforced, and a large number of cement components and stones need to be placed by manpower.

Fortunately, the manpower in the area around Taihu Lake was idle again at this time, and the people's power in Jiangning, Guangde, and Runchang Suxiuhu Prefectures could be used again.

Anyway, there are many debts and there are not enough lice, Su You waved his hand, Suxiu and the two states, taking advantage of the small water this year, just to seize the good time for the downstream dredging polder work, Songjiang as the main flood channel, must be completed before March next year.

The Transshipment Department has obtained the right to print money, and now that it has a wide range of hands, it will continue to recruit people and speed up the construction of water conservancy projects in the lower reaches of Taihu Lake.

As for the Sitong firm, it will start the port project in Changhu and Changhu!

This batch of land, Su You is not ready to sell, he is ready to create a model model.