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The Fractionator Principle. The fractionator principle is one of the important concepts used in stereology. The importance of this principle cannot be overlooked. It appears in many different places. Although it looks different depending on how it is used, the principle is the same.
There are two parts to fractions: the numerator and the denominator. The numerator is the number that sits at the top of a fraction, and the denominator is the number that sits at the bottom of a fraction. For example, in the fraction 1/2, 1 is the numerator and 2 is the denominator.