Approximation
anything that is similar but not exactly equal to something else; approached, inaccurate expression of any data
paraxial approximation
pi is three
numerical solution
rule of twelfths
stationary phase approximation
Rule of 72
scale analysis
sigma approximation
effective medium approximations
Born approximation
empty lattice approximation
point counting
curve fitting
Born-Oppenheimer approximation
least-squares function approximation
Schild's ladder
two-stream approximation
stochastic approximation