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  2. Greek numerals - Wikipedia

    en.wikipedia.org/wiki/Greek_numerals

    The first line contains the number "͵θϡϟϛ δʹ ϛʹ", i.e. "9,996 + 14 + 1 ⁄ 6". It features each of the special numeral symbols sampi (ϡ), koppa (ϟ), and stigma (ϛ) in their minuscule forms. Greek numerals are decimal, based on powers of 10. The units from 1 to 9 are assigned to the first nine letters of the old Ionic alphabet ...

  3. Ancient Greek units of measurement - Wikipedia

    en.wikipedia.org/wiki/Ancient_Greek_units_of...

    Smaller units of length Unit Greek name Equal to Modern equivalent Description daktylos δάκτυλος: 19.3 mm (0.76 in) finger kondylos κόνδυλος

  4. Babylonian mathematics - Wikipedia

    en.wikipedia.org/wiki/Babylonian_mathematics

    The diagonal displays an approximation of the square root of 2 in four sexagesimal figures, 1 24 51 10, which is good to about six decimal digits. 1 + 24/60 + 51/60 2 + 10/60 3 = 1.41421296... The tablet also gives an example where one side of the square is 30, and the resulting diagonal is 42 25 35 or 42.4263888...

  5. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  6. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    By using a dot to divide the digits into two groups, one can also write fractions in the positional system. For example, the base 2 numeral 10.11 denotes 1×2 1 + 0×2 0 + 1×21 + 1×22 = 2.75. In general, numbers in the base b system are of the form:

  7. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    The arrangement of digits on calculator and other numeric keypads with the 7-8-9 keys two rows above the 1-2-3 keys is derived from calculators and cash registers. It is notably different from the layout of telephone Touch-Tone keypads which have the 1 - 2 - 3 keys on top and 7 - 8 - 9 keys on the third row.

  8. 10-cube - Wikipedia

    en.wikipedia.org/wiki/10-cube

    It can be named by its Schläfli symbol {4,3 8}, being composed of 3 9-cubes around each 8-face. It is sometimes called a dekeract , a portmanteau of tesseract (the 4-cube ) and deka- for ten (dimensions) in Greek , It can also be called an icosaronnon or icosa-10-tope as a 10 dimensional polytope , constructed from 20 regular facets .

  9. Method of complements - Wikipedia

    en.wikipedia.org/wiki/Method_of_complements

    This tab prevented the carry from being propagated past it, the Comptometer's method of dropping the initial 1 from the result. [2] The Curta calculator used the method of complements for subtraction, and managed to hide this from the user. Numbers were entered using digit input slides along the side of the device.