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  2. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Using all numbers and all letters except I and O; the smallest base where ⁠ 1 / 2 ⁠ terminates and all of ⁠ 1 / 2 ⁠ to ⁠ 1 / 18 ⁠ have periods of 4 or shorter. 35: Covers the ten decimal digits and all letters of the English alphabet, apart from not distinguishing 0 from O. 36: Hexatrigesimal [57] [58]

  3. The repeating decimal commonly written as 0.999... represents exactly the same quantity as the number one. Despite having the appearance of representing a smaller number, 0.999... is a symbol for the number 1 in exactly the same way that 0.333... is an equivalent notation for the number represented by the fraction 1 ⁄ 3 .

  4. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    To resolve ambiguity, "P1M" is a one-month duration and "PT1M" is a one-minute duration (note the time designator, T, that precedes the time value). The smallest value used may also have a decimal fraction, [39] as in "P0.5Y" to indicate half a year. This decimal fraction may be specified with either a comma or a full stop, as in "P0,5Y" or "P0 ...

  5. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    In order for this to occur, optical clocks must be consistently capable of measuring frequency with accuracy at or better than 2 × 10 −18. In addition, methods for reliably comparing different optical clocks around the world in national metrology labs must be demonstrated [ clarification needed ] , and the comparison must show relative clock ...

  6. Carl Friedrich Gauss - Wikipedia

    en.wikipedia.org/wiki/Carl_Friedrich_Gauss

    This is an accepted version of this page This is the latest accepted revision, reviewed on 14 February 2025. German mathematician, astronomer, geodesist, and physicist (1777–1855) "Gauss" redirects here. For other uses, see Gauss (disambiguation). Carl Friedrich Gauss Portrait by Christian Albrecht Jensen, 1840 (copy from Gottlieb Biermann, 1887) Born Johann Carl Friedrich Gauss (1777-04-30 ...

  7. Diving cylinder - Wikipedia

    en.wikipedia.org/wiki/Diving_cylinder

    The pressure vessel is a seamless cylinder normally made of cold-extruded aluminum or forged steel. [5] Filament wound composite cylinders are used in fire fighting breathing apparatus and oxygen first aid equipment because of their low weight, but are rarely used for diving, due to their high positive buoyancy.

  8. Timeline of Russian innovation - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_Russian_innovation

    Its bronze-cast barrel has a calibre of 890 mm (35.0 in), and an external diameter of 1,200 mm (47.2 in). Along with a new carriage, the 2 ton cannonballs surrounding the cannon were added in 1835 and are larger than the diameter of its barrel; in fact, it was originally designed to fire 800 kg stone grapeshot.