lower(upper) approximation operator

Upper lower approximation

Upper(lower) approximation

Covering Lower Approximation

level upper lower boundary area

lower (upper) confidence limit

Lower and Upper Approximation Operators

Lower approximation

lower approximation consistent set

Lower approximation reasoning

lower approximation set

lower upper semicontinuous

lower upper solutions

Lower-upper solution

Lower-upper solution method

lower-upper solutions

lower-upper(LU) triangular decomposition of the variance matrix

LU Lower-Upper decomposition

method of lower-upper solutions