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, 19:28, 5 May 2008→Note 9: markup
===Note 9===
===Note 9===
Another way of looking at this situation is by letting the (first order) differential features <math>\operatorname{d}u, \operatorname{d}v, \operatorname{d}w</math> be viewed as the features of another universe of discourse, called the "tangent universe to <math>X\!</math> with respect to the interpretation <math>c\!</math> " and represented as <math>\operatorname{d}X \cdot c</math> . In this setting, <math>\operatorname{D}q \cdot c</math> , the "difference proposition of <math>q\!</math> at the interpretation <math>c\!</math> ", where <math>c = u\ v\ w</math> , is marked by the shaded region in Figure 4.
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| dX.c |
| dX.c |
