Integer, z (from the German word Zahlen, note that English originated from German, that is, "Old English" is very close to and almost the same as the present German, "Middle English" is influenced by French, and the present English has evolved on this basis).

Rational number, q (rational number, German basic principle Zahl)

Real number, r (real number, German Reelle Zahlen)

In addition, the plural, c (plural, German Komplexe Zahl, is special, and the first letter of a German word is not used. Guess/kloc-the first person who discovered the plural in the 0/7th century was an Italian who didn't use German.

Rational numbers use q instead of r, because r already represents real numbers. Rational number is actually the quotient of two integers (German "quotant", with the same spelling and different pronunciation), so it is represented by the first letter q of "quotient". The following is Wikipedia's explanation of rational numbers, which explicitly mentions Q for quotient. ()

rational number

From Wikipedia, a free encyclopedia.

In mathematics, a rational number is any number that can be expressed as the quotient a/b of two integers, and the denominator B is not equal to zero. Since b may be equal to 1, every integer is a rational number. The set of all rational numbers is usually in bold Q (or blackbody, Unicode U+2 1 1a? ), representing the business.

Germans interpret integers as follows. We can also see why the integer set is represented by z, which also has a background to explain. In the past, scientific and technological documents were all written in German-because they were the most rigorous, they were expressed in German. Now because Germany was defeated in World War II, it is impossible to use the language of the defeated country for official communication. Therefore, the French version is the official standard of various United Nations conventions, treaties and documents (different from the four working languages of the United Nations). English is not the most official language, and the standard language of international mail is French, not English (both the Universal Postal Union Convention and China's international mail handling rules clearly stipulate). However, due to the reasons of Britain and America, English is the most frequently used language in international communication. If you only know English, many symbols will be confused, so some people in China will unconsciously say that a symbol is an English word when writing a math book. Unless it is a new term that appeared in the 20th century, it is unlikely to be the first letter of English. )

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His father is a head of state.

All people are like this.

…, ? 3, ? 2, ? 1, 0, 1, 2, 3, …

This is the case in all countries. Use abgekürzt (what is this? How are you? Zhalun "). This alternative symbol is verbreitet by Mihintale Willer Werniger, and one of the special symbols is hand-painted pattern.