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In many contexts, when a number is spoken, the function of the separator is assumed by the spoken name of the symbol: comma or point in most cases. [6] [2] [7] In some specialized contexts, the word decimal is instead used for this purpose (such as in International Civil Aviation Organization-regulated air traffic control communications).
Full stop: Interpunct, Period: Decimal separator: ♀ ♂ ⚥ Gender symbol: LGBT symbols ` Grave (symbol) Quotation mark#Typewriters and early computers ̀: Grave (diacrictic) Acute, Circumflex, Tilde: Combining Diacritical Marks, Diacritic > Greater-than sign: Angle bracket « » Guillemet: Angle brackets, quotation marks: Much greater than ...
Usually this separator is a period or full stop, or a comma. Digits to the right of it are multiplied by 10 raised to a negative power or exponent. The first position to the right of the separator indicates 10 −1 (0.1), the second position 10 −2 (0.01), and so on for each successive position.
In general, digits should be grouped and separated either by commas or by narrow gaps (never a period/full point). Grouping with commas Left of the decimal point, five or more digits are grouped into threes separated by commas (e.g. 12,200; 255,200 km; 8,274,527th; 1 ⁄ 86,400).
Here, the numbers may come as close as they like to 12, including 11.999 and so forth (with any finite number of 9s), but 12.0 is not included. In some European countries, the notation [ 5 , 12 [ {\displaystyle [5,12[} is also used for this, and wherever comma is used as decimal separator , semicolon might be used as a separator to avoid ...
2. and + are the generalized numbers that are added to the real line to form the extended real line. 3. is the generalized number that is added to the real line to form the projectively extended real line. (fraktur 𝔠)
The comma-free approach is often used with partial quotations: The report observed "a 45% reduction in transmission rate". A comma is required when it would be present in the same construction if none of the material were a quotation: In Margaret Mead's view, "we must recognize the whole gamut of human potentialities" to enrich our culture.
Conversely the period of the repeating decimal of a fraction c / d will be (at most) the smallest number n such that 10 n − 1 is divisible by d. For example, the fraction 2 / 7 has d = 7, and the smallest k that makes 10 k − 1 divisible by 7 is k = 6, because 999999 = 7 × 142857. The period of the fraction 2 / 7 is ...