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  2. 0.999... - Wikipedia

    en.wikipedia.org/wiki/0.999...

    So, it does not make sense to identify 0.999... with any number smaller than 1. Meanwhile, every number larger than 1 will be larger than any decimal of the form 0.999...9 for any finite number of nines. Therefore, 0.999... cannot be identified with any number larger than 1, either.

  3. Decimal representation - Wikipedia

    en.wikipedia.org/wiki/Decimal_representation

    The decimal representation represents the infinite sum : Every nonnegative real number has at least one such representation; it has two such representations (with if ) if and only if one has a trailing infinite sequence of 0, and the other has a trailing infinite sequence of 9. For having a one-to-one correspondence between nonnegative real ...

  4. Fractional excretion of sodium - Wikipedia

    en.wikipedia.org/wiki/Fractional_excretion_of_sodium

    CSF/S glu = 0.6. The fractional excretion of sodium (FE Na) is the percentage of the sodium filtered by the kidney which is excreted in the urine. It is measured in terms of plasma and urine sodium, rather than by the interpretation of urinary sodium concentration alone, as urinary sodium concentrations can vary with water reabsorption.

  5. Continued fraction - Wikipedia

    en.wikipedia.org/wiki/Continued_fraction

    Continued fraction. A finite regular continued fraction, where is a non-negative integer, is an integer, and is a positive integer, for . In mathematics, a continued fraction is an expression obtained through an iterative process of representing a number as the sum of its integer part and the reciprocal of another number, then writing this ...

  6. 1/9 - Wikipedia

    en.wikipedia.org/wiki/1/9

    1/9 (number), a fraction (one ninth, 1⁄9) 1st Battalion, 9th Marines, an infantry battalion of the United States Marine Corps. January 9 or September 1, depending on date format. Breaker 1/9, a song by Common. Former 1 (New York City Subway service) and 9 (New York City Subway service), which shared the same route. U.S. Route 1/9, in New Jersey.

  7. Aspect ratio (image) - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio_(image)

    The aspect ratio of an image is the ratio of its width to its height. It is expressed as two numbers separated by a colon, width:height. Common aspect ratios are 1.85:1 and 2.40:1 in cinematography, 4:3 and 16:9 in television, and 3:2 in still photography .

  8. Ninth grade - Wikipedia

    en.wikipedia.org/wiki/Ninth_grade

    Ninth grade. Appearance. Ninth grade (also 9th grade or grade 9) is the ninth or tenth year of formal or compulsory education in some countries. It is generally part of middle school or secondary school depending on country. Students in ninth grade are usually 14–15 years old, but in some countries are 15–16.

  9. Orders of magnitude (numbers) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(numbers)

    Mathematics: 608,981,813,029 is the smallest number for which there are more primes of the form 3k + 1 than of the form 3k + 2 up to the number. 10 12 10 12 stars in the Andromeda Galaxy (1 000 000 000 000; 1000 4; short scale: one trillion; long scale: one billion) ISO: tera-(T)