Logarithm was founded by an Englishman, Napier (1550 ~ 16 17), and he also coined the word logarithm. This word is a combination of a Greek word (typing, translated into Latin logos, meaning words or symbols expressing thoughts, or "calculation" or "ratio") and another Greek word (numbers, sorry, I don't know how to write in Latin). Napier used the whole word logarithm when expressing logarithm, and did not simplify it. Kepler did not simplify the word "log" until 1624, and Autre did not use the simplified "log" until 1647. 1632, cavalieri became the first person to adopt symbolic log. 182 1 year, Covent uses "l" and "l" to represent the natural logarithm and the logarithm of any base greater than 1 respectively. In 1893, piano uses "Logx" and "logx" to represent the logarithm based on e and the logarithm based on 10 respectively. In the same year, Stringham used "blog", "ln" and "logk ..." to represent the logarithm based on b, the natural logarithm and the logarithm based on the complex modulus k, respectively. 1902, Stolc et al. used "alog.b" to represent the logarithm of b with a base, which became a modern mathematical expression after gradual improvement and evolution. /kloc-In the middle of the 7th century, Munger introduced logarithms to China. /kloc-At the beginning of the 7th century, Xue Fengzuo's "Sydney Huitong" had a "proportional table" (1653, also called "proportional logarithm table"), in which the real number was called "original number" and the logarithm was called "proportional number". In mathematics, it is called logarithmic proportion: "Logarithmic proportion is made by nabil, and the borrowed number is paired with the real number, so it is named logarithmic table." Since then, it has been established in China, called logarithm. For the discovery process of logarithm, please refer to the following information. Answer time: 2011-10-241:13: 59.