It has been used in China since ancient timesDecimal systemCounting, some practicalUnit of measurementIt also uses decimal system, so it is easy to generate decimal fraction, that is, the concept of decimal.The first one to express this concept in words was in the Wei and Jin dynastiesLiu Hui。He's calculatingPiIn the process of, seven units are used, namely, ruler, inch, minute, centimeter, millisecond, second and blink;Smaller units below zero are no longer named, but collectively referred to as "differential numbers".
In the Song and Yuan Dynasties,decimalThe concept has been further popularized and expressed more clearly.Yang Hui's Daily Use Algorithm (1262) contains a formula for conversion of two kilograms: "One calculation, six two five; two calculation, one two five", that is, 1/16=0?0625；2/16=0?125。 The "interval" and "retreat" here have the meaning of indicating the decimal point position.Qin Jiushao noted the unit inInteger partFor example, - Ⅲ - Ⅱ represents 13.12 inches, which is the earliest decimal representation in the world.
In Europe and Islamic countries,Babylon, CubaThe decimal system has been in the dominant position for a long time, and some classic scientific works use the decimal system, so the concept of decimal decimal has not developed yet.Alkasi (?~1429) in Central Asia was the first application outside China in the 15th centurydecimalPeople.European mathematicians did not begin to consider decimals until the 16th century, especially the DutchSteven(1548-1620), he clearly expressed the method in his book On Decimal System (1583).For example, record 5.714 as: 5 ◎ 7 ① 1 ② 4 ③ or 5,7'1 ''4' '.The first person who expressed decimal numbers in the form commonly used in the world today was German mathematician KlaWeiss(1537~1612), he began to use the decimal point asInteger partThe delimiter between and the decimal part.
And China adopted the decimal number more than 300 years earlier than Europe.
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The decimal point can be said to be insignificant, but it has set off a modest wave in the US stock market.
Since January 29, 2001,New York stock exchange (NYSE) ended the 3-year hexadecimal pricing method and fully used the decimal pricing method.But nearly two months after the implementation of the new pricing method, the market reaction is that retail investors applaud, while institutional investors complain,stock exchangeI am very busy.
Mark Tellini, vice president of Charles Schwab, said, "The decimal valuation method has brought benefits to retail investors because the bid ask spread has narrowed." Last summer, when the New York Stock Exchange tried the decimal valuation method, two professors in charge of research found that the decimal valuation method reduced the bid ask spread by at least one third.For example, for a 1000 share transaction, the price difference of 1/16 is equal to $62.5, which is far greater than the commission charged by online stock agents.After the decimal valuation method, the trading price difference of 1000 shares is only 10 dollars.
Credit Suisse tracked the trading of their stocks in the first 15 days and the last 5 days when the New York Stock Exchange implemented the decimal pricing method, and found that the bid ask spread of the stocks was reduced by 56.6%.
While individual investors benefited, institutional investors complained that after adopting the decimal valuation method, the order difference of stock price jump increased, which made it difficult for them to trade block stocks.When stocks are priced in hexadecimal system, there is a difference of 16 points between every dollar in each transaction.However, after using the decimal pricing method, there is a difference of 100 points between each dollar, which makes it difficult for them to determine where the next transaction price point will appear.After the decimal valuation method is implemented, the stock transaction price is likely to jump from 0.08 dollars to 0.15 dollars, which makes the market more unpredictable.In addition, decimal pricing also means that you can place orders at several different prices at the same time.According to the statistics of Jiaxin, since the implementation of the decimal pricing method, the number of orders placed by the company's customers has increased by 6.5%.
How to solve a series of problems caused by decimal pricing method seems to have a more far-reaching significance.Because NASDAQ has also started to convert some stocks in its exchange into decimal pricing since March, and by the end of last week, the number of stocks with decimal pricing had reached more than 100.As an innovation, the decimal valuation method is the trend of the times.
About the story
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On August 23, 1967, when the Soyuz 1 spacecraft of the former Soviet Union was returning to the atmosphere, a vicious accident suddenly occurred - the deceleration parachute could not be opened.After studying, the central leadership of the former Soviet Union decided to broadcast the accident to the whole country.When the broadcaster of the TV station announced in a heavy tone that the spaceship would crash in two hours, and the audience would witness the news of the death of astronaut Vladimir Komarov, the whole country was shocked, and people were immersed in great grief.
On the TV station, the audience saw the calm image of astronaut Komarov, who smiled and said to his mother, "Mom, I can see your image clearly here, including every white hair on your head. Can you see me clearly?",Komarov's daughter also appeared on the TV screen. She was only 12 years old.Komashov said, "Daughter, don't cry." "I don't cry..." Her daughter was choked with tears, but she tried to bear the pain and said: "Dad, you are a Soviet hero, and I want to tell you that the daughter of a hero will live like a hero!" Komashov told her: "When learning, you should take every decimal point seriously.What happened to Soyuz One today is that a decimal point was ignored during the ground inspection... "
As time went by, it was only 7 minutes before the spaceship crashed. Komarov waved to the TV audience all over the country and said, "My fellow citizens, please allow me to bid farewell to you in this vast space."
This is a soul stirring farewell ceremony.Komarov has gone forever, leaving behind his eternal love for his relatives and motherland.But what was more striking was what he said to his daughter.It warns people that they should not be careless about life, otherwise, even a trivial matter will make you pay a heavy price that can never be remedied.[1]
English Pronunciation
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In EnglishdecimalThe decimal point is read as "point", and the integer part is read asCardinal number wordThe decimal part is read separately.
For example, 123.123 is read as: one hundred and two three point one two three
