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Approximations

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approximation
An approximation is anything that is intentionally similar but not exactly equal to something else.
Stirling's approximation
approximation for factorials
Taylor's theorem
approximation of a function by a truncated power series
engineering tolerance
permissible limit(s) of variation in an engineered component or system
Born-Oppenheimer approximation
The notion that the motion of atomic nuclei and electrons can be separated
WKB approximation
method for finding approximate solutions to linear differential equations with spatially varying coefficients
precision
measure of random errors in a system: the variation among measurements of the same value
Variational method
Method for the determination of the approximate ground state of a quantum mechanical system.
linearization
In mathematics, linearization (British English: linearisation) is finding the linear approximation to a function at a given point. The linear approximation of a function is the first order Taylor expansion around the point of interest. In the study of dynamical systems, linearization is a method for assessing the local stability of an equilibrium point of a system of nonlinear differential equations or discrete dynamical systems. This method is used in fields such as engineering, physics, economics, and ecology.
approximations of π
history of calculating π to degrees of precision
Hartman–Grobman theorem
theorem
Successive approximation ADC
type of analog-digital conversion
Ultrarelativistic limit
very close to the speed of light
tolerance relation
reflexive symmetric relation compatible with the operations of an algebraic structure
back-of-the-envelope calculation
rough calculation used to find the order of value of a variable rather then the exact value
rough set
formal approximation of a crisp (i.e. conventional) set
Milü
thumb|right|Fractional approximations of
approximate computing
computation of possibly inaccurate results, but typically faster and more energy efficient