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  2. Fine-structure constant - Wikipedia

    en.wikipedia.org/wiki/Fine-structure_constant

    As such, the fine-structure constant is chiefly a quantity determining (or determined by) the elementary charge: e = √ 4πα ≈ 0.302 822 12 in terms of such a natural unit of charge. In the system of atomic units , which sets e = m e = ħ = 4 πε 0 = 1 , the expression for the fine-structure constant becomes α = 1 c . {\displaystyle ...

  3. Decimal separator - Wikipedia

    en.wikipedia.org/wiki/Decimal_separator

    Symbol-specific names are also used; decimal point and decimal comma refer to a dot (either baseline or middle) and comma respectively, when it is used as a decimal separator; these are the usual terms used in English, [1] [2] [3] with the aforementioned generic terms reserved for abstract usage. [4] [5] In many contexts, when a number is ...

  4. Prime number theorem - Wikipedia

    en.wikipedia.org/wiki/Prime_number_theorem

    This striking formula is one of the so-called explicit formulas of number theory, and is already suggestive of the result we wish to prove, since the term x (claimed to be the correct asymptotic order of ψ(x)) appears on the right-hand side, followed by (presumably) lower-order asymptotic terms.

  5. Hexadecimal - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal

    Hexadecimal (also known as base-16 or simply hex) is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9 and "A"–"F" to represent values from ten to fifteen.

  6. Image sensor format - Wikipedia

    en.wikipedia.org/wiki/Image_sensor_format

    Sizes are often expressed as a fraction of an inch, with a one in the numerator, and a decimal number in the denominator. For example, 1/2.5 converts to 2/5 as a simple fraction, or 0.4 as a decimal number. This "inch" system gives a result approximately 1.5 times the length of the diagonal of the sensor.

  7. List of regions by past GDP (PPP) - Wikipedia

    en.wikipedia.org/wiki/List_of_regions_by_past...

    B ^ Decimal fractions rounded to the nearest tenth. Italic numbers not directly given by the authors; they are obtained by multiplying the respective value of GDP per capita by estimated population size.

  8. National Origins Formula - Wikipedia

    en.wikipedia.org/wiki/National_Origins_Formula

    Or the formula could be solved to compute the quota by converting the fraction for the national origin into decimal form, then multiplying to take the equivalent percentage share of 150,000: ⁠ 39,216,333 / 89,506,558 ⁠ = 0.4381392143 × 150,000 = 65720.882 ≈ 65,721 .

  9. Bitcoin - Wikipedia

    en.wikipedia.org/wiki/Bitcoin

    The term hodl was created in December 2013 for holding bitcoin rather than selling it during periods of volatility. [152] [153] Other economists, investors, and the central bank of Estonia have described bitcoin as a potential Ponzi scheme.