Which country invented the nine-ring game?

Nine-ring is a representative traditional intellectual toy in China, which embodies the traditional culture of China and is very interesting. Jiuhuanhuan can practice both brain and hand, which is of great benefit to developing people's logical thinking ability and moving fingers and bones. At the same time, it can also cultivate the spirit of concentration and patience in study and work, which is really a Xian Yi for all ages.

Jiu Lian Huan has a very long history and is said to have been invented during the Warring States Period. It is one of the most mysterious toys invented by human beings. After the Song Dynasty, the Nine-Chain began to spread widely. During the Ming and Qing Dynasties, people from scholar-officials to peddlers liked it. Many famous literary works have mentioned the Nine-Chain, and there is a record of Lin Daiyu's ingenious interpretation of the Nine-Chain in the Dream of Red Mansions. In foreign countries, cardano, a mathematician, had already mentioned Nine Chains in A.D. 1550. Later, the mathematician Wallis made an incisive analysis of the Nine Rings. Gross also deeply studied the nine chains and gave it a perfect answer with binary numbers.

Nine rings are mainly composed of nine rings and frames. Each ring is connected with a straight rod, each straight rod passes through the latter ring, and the other ends of the nine straight rods are relatively fixed by plates or rings. The ring can be detached or placed on the frame. Playing with the Nine Rings is to untie all the Nine Rings or put them on the frame. The play of Nine-Chain is complicated, and certain rules must be followed whether it is untied or put on.

Gross has proved in the19th century that * * * needs 34 1 step, so far there is no other more convenient answer. 1975 A book on discrete mathematics was published abroad, which contains such a series: 1, 2,5,1,2 1, 42,85,170,341.

In fact, the number of steps required to solve or put an N chain can be calculated by CM formula: f (n) = [2 (n1)-0.5 * (1) n-1.5]/3.

The nine-ring chain is really interlocking and interesting. The first time you play, you need to combine analysis and synthesis, and keep thinking and reasoning. Complex gameplay requires patience and a style that is not impatient in the face of difficulties. Never be impetuous and use violence. The more times you play the Nine-Chain, the more proficient you are, and the deeper your understanding of the gameplay, and the better your understanding of the inner thoughts.

You can also buy it in Japan.

If you like the nine-ring game, you can buy it in the department store toy franchise store.