Measures of Scale

So if...

4(P5) - M3 - 2(T) = X

..then what's a good name for "X"? Size of the syntonic comma? Is this a
good definition of the syntonic comma? So a meantone tuning is one where
the syntonic comma is best represented by zero steps?

And if...

12(P5) - 7(T) = Y

..then what's a good name for "Y"? The degree of positive or negetiveness?
Isn't this the definition of the Pythagorean comma?

When are these measures the same? Does anybody know of any other useful
measures for scales?

Carl


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