Changes

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The information borne by <math>\operatorname{D}f</math> should be clear enough from a survey of these six points &mdash; they tell you what you have do from each point of <math>X\!</math> in order to change the value borne by <math>f(p, q),\!</math> that is, the move you have to make in order to reach a point where the value of the proposition <math>f(p, q)\!</math> is different from what it is where you started.

The information borne by <math>\operatorname{D}f</math> should be clear enough from a survey of these six points &mdash; they tell you what you have to do from each point of <math>X\!</math> in order to change the value borne by <math>f(p, q),\!</math> that is, the move you have to make in order to reach a point where the value of the proposition <math>f(p, q)\!</math> is different from what it is where you started.

==Note 5==

==Note 5==