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  2. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    For example, 7 divided by 2 is 3 with a remainder of 1. These difficulties are avoided by rational number arithmetic, which allows for the exact representation of fractions. [75] A simple method to calculate exponentiation is by repeated multiplication.

  3. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  4. Titanic - Wikipedia

    en.wikipedia.org/wiki/Titanic

    92 ft 6 in (28.2 m) Height: 175 ft (53.3 m) (keel to top of funnels) Draught: 34 ft 7 in (10.5 m) Depth: 64 ft 6 in (19.7 m) Decks: 9 (A–G) Installed power: 24 double-ended and five single-ended boilers feeding two reciprocating steam engines for the wing propellers, and a low-pressure turbine for the centre propeller; [3] output: 46,000 HP ...

  5. Greenhouse effect - Wikipedia

    en.wikipedia.org/wiki/Greenhouse_effect

    A planet will tend towards a state of radiative equilibrium, in which the power of outgoing radiation equals the power of absorbed incoming radiation. [ 47 ] Earth's energy imbalance is the amount by which the power of incoming sunlight absorbed by Earth's surface or atmosphere exceeds the power of outgoing longwave radiation emitted to space.

  6. National debt of the United States - Wikipedia

    en.wikipedia.org/wiki/National_debt_of_the...

    Mathematically, this is the debt divided by the GDP amount. The Congressional Budget Office includes historical budget and debt tables along with its annual "Budget and Economic Outlook". Debt held by the public as a percentage of GDP rose from 34.7% GDP in 2000 to 40.5% in 2008 and 67.7% in 2011. [34]

  7. Galaxy - Wikipedia

    en.wikipedia.org/wiki/Galaxy

    Galaxies, averaging an estimated 100 million stars, [3] range in size from dwarfs with less than a thousand stars, [4] to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy's centre of mass. Most of the mass in a typical galaxy is in the form of dark matter, with only a few per cent of that mass ...

  8. Self-Defence of the Republic of Poland - Wikipedia

    en.wikipedia.org/wiki/Self-Defence_of_the...

    Already functioning as the National Council of the Trade Union "Self-Defense", Samoobrona delivered a new ultimatum to the government in early 1992, including the clearing of farm debts and a program of "cheap" credit for farmers, with cheap defined as credits with an interest rate below the inflation level, which amounted to 40% in 1992.

  9. California - Wikipedia

    en.wikipedia.org/wiki/California

    California (/ ˌ k æ l ɪ ˈ f ɔːr n j ə /) is a state in the Western region of the United States that lies on the Pacific Coast.It borders Oregon to the north, Nevada and Arizona to the east, and shares an international border with the Mexican state of Baja California to the south.