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geometry of numbers
(number theory) The subbranch of number theory which applies techniques from geometry to the study of algebraic numbers.
Fresnel numbers
plural of Fresnel number
Fresnel number
(optics) A dimensionless quantity (denoted F), such that for an electromagnetic wave passing through an aperture and hitting a screen, F=(a²)/(L𝜆) where a is the characteristic size (e.g. radius) of the aperture, L is the distance of the screen from the aperture, and 𝜆 is the incident wavelength.
Stirling numbers of the second kind
Stirling numbers
plural of Stirling number
Stirling number
(mathematics) Stirling number of the first kind / (mathematics) Stirling number of the second kind
Lah number
(mathematics) Any of a class of coefficients expressing rising factorials in terms of falling factorials.
Stirling number of the second kind
(mathematics) The number of ways to partition a set of n objects into k non-empty subsets, denoted by S(n,k).
false number 9
(soccer) An unconventional lone striker or centre-forward who drops deep into midfield.