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  2. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    The following list includes the continued fractions of some constants and is sorted by their representations. Continued fractions with more than 20 known terms have been truncated, with an ellipsis to show that they continue. Rational numbers have two continued fractions; the version in this list is the shorter one.

  3. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    But every number, including π, can be represented by an infinite series of nested fractions, called a simple continued fraction: = + + + + + + + + Truncating the continued fraction at any point yields a rational approximation for π ; the first four of these are 3 , ⁠ 22 / 7 ⁠ , ⁠ 333 / 106 ⁠ , and ⁠ 355 / 113 ⁠ .

  4. Orders of magnitude (pressure) - Wikipedia

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

    Orders of magnitude (pressure) on Wikipedia provides an overview of pressure measurements and their corresponding orders of magnitude.

  5. Dimensional analysis - Wikipedia

    en.wikipedia.org/wiki/Dimensional_analysis

    For example, one might choose force, length and mass as the base dimensions (as some have done), with associated dimensions F, L, M; this corresponds to a different basis, and one may convert between these representations by a change of basis. The choice of the base set of dimensions is thus a convention, with the benefit of increased utility ...

  6. Hypercalcaemia - Wikipedia

    en.wikipedia.org/wiki/Hypercalcaemia

    Severe hypercalcaemia (above 15–16 mg/dL or 3.75–4 mmol/L) is considered a medical emergency: at these levels, coma and cardiac arrest can result. The high levels of calcium ions decrease the neuron membrane permeability to sodium ions, thus decreasing excitability, which leads to hypotonicity of smooth and striated muscle. This explains ...

  7. List of sovereign states by tax revenue to GDP ratio - Wikipedia

    en.wikipedia.org/wiki/List_of_sovereign_states...

    General; Tax avoidance. Repatriation tax avoidance; Tax evasion; Tax resistance; Tax shelter; Debtors' prison; Smuggling; Black market; Unreported employment; Corporate

  8. List of U.S. states and territories by GDP - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._states_and...

    The following list includes the annual nominal gross domestic product for each of the 50 U.S. states and the national capital of Washington, D.C. and the GDP change and GDP per capita as of 2024.

  9. Soviet Union - Wikipedia

    en.wikipedia.org/wiki/Soviet_Union

    The Union of Soviet Socialist Republics [u] (USSR), [v] commonly known as the Soviet Union, [w] was a transcontinental country that spanned much of Eurasia from 1922 to 1991. . During its existence, it was the largest country by area, extending across eleven time zones and sharing borders with twelve countries, and the third-most populous co