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number > mathematical constant > square root of 5

number > complex number > quadratic integer > square root of 5

number > number theory > algebraic number theory > quadratic integer > square root of 5

... > abstract algebra > algebraic structure > ring theory > quadratic integer > square root of 5

number > irrational number > square root of 5

Preferred term

square root of 5

The square root of 5 is the positive real number that, when multiplied by itself, gives the prime number 5. It is more precisely called the principal square root of 5, to distinguish it from the negative number with the same property. This number appears in the fractional expression for the golden ratio. It can be denoted in surd form as:
${\\displaystyle {\\sqrt {5}}.\\,}$
It is an irrational algebraic number. The first sixty significant digits of its decimal expansion are:
2.23606797749978969640917366873127623544061835961152572427089... (sequence A002163 in the OEIS).
which can be rounded down to 2.236 to within 99.99% accuracy. The approximation 161/72 (≈ 2.23611) for the square root of five can be used. Despite having a denominator of only 72, it differs from the correct value by less than 1/10,000 (approx. 4.3×10⁻⁵). As of January 2022, its numerical value in decimal has been computed to at least 2,250,000,000,000 digits.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Square_root_of₅)

racine carrée de cinq

French

URI

http://data.loterre.fr/ark:/67375/PSR-G77CM1W3-K

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