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  2. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  3. Prime constant - Wikipedia

    en.wikipedia.org/wiki/Prime_constant

    The prime constant is the real number whose th binary digit is 1 if is prime and 0 if is composite or 1. [ 1 ] In other words, ρ {\displaystyle \rho } is the number whose binary expansion corresponds to the indicator function of the set of prime numbers .

  4. Plastic ratio - Wikipedia

    en.wikipedia.org/wiki/Plastic_ratio

    In mathematics, the plastic ratio is a geometrical proportion close to 53/40.Its true value is the real solution of the equation x 3 = x + 1.. The adjective plastic does not refer to the artificial material, but to the formative and sculptural qualities of this ratio, as in plastic arts.

  5. Dynamic pressure - Wikipedia

    en.wikipedia.org/wiki/Dynamic_pressure

    In fluid dynamics, dynamic pressure (denoted by q or Q and sometimes called velocity pressure) is the quantity defined by: [1] = where (in SI units): q is the dynamic pressure in pascals (i.e., N/m 2, ρ (Greek letter rho) is the fluid mass density (e.g. in kg/m 3), and; u is the flow speed in m/s.

  6. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    1. Means "less than or equal to". That is, whatever A and B are, A ≤ B is equivalent to A < B or A = B. 2. Between two groups, may mean that the first one is a subgroup of the second one. ≥ 1. Means "greater than or equal to". That is, whatever A and B are, A ≥ B is equivalent to A > B or A = B. 2.

  7. Radial distance - Wikipedia

    en.wikipedia.org/wiki/Radial_distance

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Special pages; Pages for logged out editors learn more

  8. Spearman's rank correlation coefficient - Wikipedia

    en.wikipedia.org/wiki/Spearman's_rank_correlation...

    Intuitively, the Spearman correlation between two variables will be high when observations have a similar (or identical for a correlation of 1) rank (i.e. relative position label of the observations within the variable: 1st, 2nd, 3rd, etc.) between the two variables, and low when observations have a dissimilar (or fully opposed for a ...

  9. Spectral radius - Wikipedia

    en.wikipedia.org/wiki/Spectral_radius

    In mathematics, the spectral radius of a square matrix is the maximum of the absolute values of its eigenvalues. [1] More generally, the spectral radius of a bounded linear operator is the supremum of the absolute values of the elements of its spectrum. The spectral radius is often denoted by ρ(·).

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