Cheng dawei generation abacus master

"The great book has a long history. To solve the problem of the taste of the pearl river, the former residence is a journey. In huangshan, you turn on the TV set every night to watch "huangshan news", and this piece of advertising that comes with a picture will resound in your ear. Maybe you are a tourist from a field trip to yucheng. After visiting huangshan and strolling the old streets, you can find this advertisement with high cultural taste, which will generate interest in the old residence.

The former residence is located in the east of the tunxi district (now former garden village), the second floor building, two and three blocks of brick structure, covering an area of 540 square meters, built in the period of mingzhengde. The outer cornice of the gatehouse, the arch of the arch, the horsehead wall. West side is the ancestral building, five opens, leaning on the main building. The entrance is a "bing garden", with antique corridors, lawns and flower beds. In the original artificial aqueduct of linbin, the local cheng's descendants called the canal "the public canal". Big cheng (1533-1606), the word RuSi, bing canal, the former residence of the underlying set viewing don, cheng dawei floor west room for the bedroom, there are wooden bed, table, chair and so on display, with mosquito nets, bedding, etc. In front of the court cheng dawei has carved lacquer on the table, left and right wing hang Cheng Shi "ask teachers and students", "navigate with", "measurement steps car", "ponder on the rate of mouth", etc. 10 life picture.

Cheng was born into a small merchant family and was very smart and clever. According to cheng's genealogy, he is "adept at ancient seal and good arithmetic". As a teenager, he went into business with his father and traveled all over wuchu region. In business dealings, I feel the inconvenience of traditional counting method, and I am determined to compile a concise and practical mathematics book. Then, the hong merchants, he visited the mathematics masters and abacus calculation, at the same time, not hesitate heavy gold to buy a suicide note, carefully studying mathematics basic theory knowledge, and collected a lot of ancient Chinese mathematics problems and calculation methods. After the age of 40, he abandoned his business and wrote books. In 1592, after nearly 20 years of assiduous study, cheng was finally able to complete the seminal work of the book of the law, which was 17 volumes and published his own expenses. In 1598, after years of revision, cheng da was published with the concise copy of the algorithm, which is the most basic reading of the private family.

Calculate teaching cases, full name, new points to calculate teaching cases (includes the content can be collected from various practical mathematical problems and mathematical methods, according to the order of the "nine chapter arithmetic", is divided into nine chapters, respectively described integer, scores of addition, subtraction, division, multiplication and exponentiation, prescribing and other basic knowledge. Abacus calculation method is the first time, in the at the same time, all kinds of calculation methods are also pointed out that the most convenient method to calculate, he thinks the multiplication to keep head on for the best, open approach in business division for the best. These methods, which are convenient and computatively accurate, are still commonly used in the calculation of bead calculation. The book is based on nine items, such as fang tian, corn millet, difference, shao guang, shang gongfu, yingshu, equation and hook, etc., which narrates various problems and solutions. The essential part of this book is the introduction of the PRD and the various methods of the abacus. For example, "jiugui song", which is still in use today, "jiugui song", "two to five, two to one ten... ". In detail, it also lists 595 questions, which are accompanied by detailed solutions. The book and the multi-purpose formula, poetry written in form, easy to understand, easy to remember, so as to greatly promote the abacus in the application of social life, so a brief history of the Chinese mathematics high praise: "in the process of the development of ancient Chinese mathematics, calculate with teaching is a very important work, from the long, broad and deep circulating, is can not be compared with any other mathematics books." This book is compiled by the qing dynasty. It not only enjoys a high reputation in China, but also translated into Japanese by the Japanese Maori at the end of the Ming dynasty, which opened Japan's "and the calculation". In the early qing dynasty, the book spread to north Korea, southeast Asia and Europe.

Cheng dawei besides has great achievements in the field of the abacus, also developed a "step measurement car", produced with bamboo sticks, similar to today's tape measure, superscript length unit, solved the problem of field measurement with feet.

There are various versions and different forms of mathematical works in the former residence. When you enter the world of abacus, you will change your view on the inherent mode of the abacus, and a small abacus will have such a big world.

The smallest display in the house is a ring abacus with a size of 1cm x 0.5cm, pure silver, embedded in a ring for qing dynasty relics. It consists of seven files, which are the shape of the seven pearl of the last two beads. The beads are less than one millimeter in diameter. It is amazing that these 35 silver beads are also standard beads, and can be freely slided on the silver beads. Of course, if the abacus calculation, only use steel instead of fingers can use this ring abacus, ancient women, whereas its main users simply raise your hand drawn from their own bun steel needle. The usual abacus is a long frame structure with wooden frame and wooden beam. However, the concept of an abacus can be broken by a sewing machine in the former residence. Every root sewing kit abacus beads rod is an independent part, to the tin bracket a bead rod and the nut on the bead rod fixed into a bar, separating the above one is at the bottom of the bead and five beads, then the nine unit root special bead rod thread sewing fixed to the grass green military canvas on the floor, be a bead on a next five bead nine abacus. Its excellent is its canvas base becomes an abacus, roll up as a "sewing kit," for hui rush about all the year round trip, nature is easy to carry and storage. It is an eye-opening nine - story abacus, which is 60 cm long and 40 cm wide. It is divided into nine layers, each of which is standard, complete with a total of 24 abacus, total counting total of 1512. The nine - level abacus is not a pure abacus, but a special abacus with practical value. It can not only perform complex mathematical operations, but also display its most intuitive and convenient digital display functions. According to the introduction, the nine-story abacus was born during the operation of huishang, usually placed on the table of Mr. Master. The accounts of each subordinate unit occupy one floor, and the next layer is the sum of the accounts of each subordinate department. Whether it's daily business or monthly business, the boss can quickly learn from the nine-story abacus. The nine-layer abacus is equivalent to the function of the modern electronic computer screen, but it is exempt from the adjustment of the key. In addition, there is an abacus and a water pipe abacus in the residence. You should know "the taste". You might as well visit the country and experience the mystery of the abacus world.

It is the unification of technology, science and philosophy and the use of the hand brain, which is of great importance to the development of human intelligence. The invention of the pearl river is a great contribution of our ancestors to mankind. Chinese-american Nobel physics prize winner on October 14, 1972, Dr Li zhen-dao to premier zhou enlai said: "our Chinese ancestors, have long been created the best computer, this is still in the national general calculated." Nowadays, although electronic computers are more popular, there is a wide range of applications. The primary school of tunxi, located at the former residence of cheng da, carries forward the teaching tradition of elementary school, which has not only cultivated a number of "god operators", but also developed to the height of pearl counting and the calculation of the mind.

From the former residence, the sound of the books and the sound of the beads in the small schoolyard is like showing people the beautiful prospect of mathematics development in huizhou.