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  2. APL syntax and symbols - Wikipedia

    en.wikipedia.org/wiki/APL_syntax_and_symbols

    Element in X[row 2; col 2] is changed (from 7) to a nested vector "Text" using the enclose ⊂ function. Element in X[row 3; col 4], formerly integer 14, now becomes a mini enclosed or ⊂ nested 2x2 matrix of 4 consecutive integers. Since X contains numbers, text and nested elements, it is both a mixed and a nested array.

  3. Exponentiation - Wikipedia

    en.wikipedia.org/wiki/Exponentiation

    For instance, 299 792 458 m/s (the speed of light in vacuum, in metres per second) can be written as 2.997 924 58 × 10 8 m/s and then approximated as 2.998 × 10 8 m/s. SI prefixes based on powers of 10 are also used to describe small or large quantities. For example, the prefix kilo means 10 3 = 1000, so a kilometre is 1000 m.

  4. List of Unicode characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Unicode_characters

    Other manufacturers used Control-X for this purpose. 10 Control-X was commonly used to cancel a line of input typed in at the terminal. 11 Control-Z has commonly been used on minicomputers, Windows and DOS systems to indicate "end of file" either on a terminal or in a text file. Unix / Linux systems use Control-D to indicate end-of-file at a ...

  5. Quadratic formula - Wikipedia

    en.wikipedia.org/wiki/Quadratic_formula

    The roots of the quadratic function y = ⁠ 1 / 2 ⁠ x 2 − 3x + ⁠ 5 / 2 ⁠ are the places where the graph intersects the x-axis, the values x = 1 and x = 5. They can be found via the quadratic formula. In elementary algebra, the quadratic formula is a closed-form expression describing the solutions of a quadratic equation.

  6. History of mathematical notation - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematical...

    The majority of Mesopotamian clay tablets date from 1800 to 1600 BC, and cover topics which include fractions, algebra, quadratic and cubic equations, and the calculation of regular numbers, reciprocals, and pairs. [10] The tablets also include multiplication tables and methods for solving linear and quadratic equations.

  7. Debt-to-GDP ratio - Wikipedia

    en.wikipedia.org/wiki/Debt-to-GDP_ratio

    At the end of the 1st quarter of 2021, the United States public debt-to-GDP ratio was 127.5%. [4] Two-thirds of US public debt is owned by US citizens, banks, corporations, and the Federal Reserve Bank; [5] approximately one-third of US public debt is held by foreign countries – particularly China and Japan.

  8. Social Security (United States) - Wikipedia

    en.wikipedia.org/wiki/Social_Security_(United...

    Spousal survivor benefits are available at 100–67% of the primary benefits rate for 8.7% to 6.7% reduction in retirement benefits, respectively. [98] University of California Retirement Plan retirement and disability plan benefits are funded by contributions from both members and the university (typically 5% of salary each) and by the ...

  9. 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 ...