Creates a Trapezoidal Fuzzy Number
For convenience, objects of class TrapezoidalFuzzyNumber
may be created with this function.
TrapezoidalFuzzyNumber(a1, a2, a3, a4)
| a1 | a number specyfing left bound of the support | 
| a2 | a number specyfing left bound of the core | 
| a3 | a number specyfing right bound of the core | 
| a4 | a number specyfing right bound of the support | 
Object of class TrapezoidalFuzzyNumber
Other TrapezoidalFuzzyNumber-method: Arithmetic,
TrapezoidalFuzzyNumber-class,
TriangularFuzzyNumber,
alphaInterval,
as.PiecewiseLinearFuzzyNumber,
as.PowerFuzzyNumber,
as.TrapezoidalFuzzyNumber,
expectedInterval, plot
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