Term information
Algorithm for approximation, i.e. "an inexact representation of something that is still close enough to be useful. Although approximation is most often applied to numbers, it is also frequently applied to such things as mathematical functions, shapes, and physical laws. Approximations may be used because incomplete information prevents use of exact representations. Many problems in physics are either too complex to solve analytically, or impossible to solve using the available analytical tools. Thus, even when the exact representation is known, an approximation may yield a sufficiently accurate solution while reducing the complexity of the problem significantly." source: http://en.wikipedia.org/wiki/Approximation
FCM
covariance matrices
approximation
harmonic approximation
finite cell method
fuzzy
covariance matrix