the lower and upper approximation

Lower approximation

Lower and Upper Approximation Operators

upper and lower

lower approximation set

Covering Lower Approximation

Upper (Lower) Approximate Operator

coupled lower and upper quasisolutions

lower approximate operator

lower thrusting and upper folding

Upper and lower air circulation

lower and upper bounds

level upper lower boundary area

lower increment approximation of union

Upper (Lower )exponent

the upper and lower bounds

cold in the upper and heat in the lower

heat in the upper and cold in the lower

lower approximations operator