Taken in the context of the tangent universe to X at c = uvw,
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Taken in the context of the tangent universe to <math>X\!</math> at <math>c = u\ v\ w</math> , written <math>\operatorname{d}X \cdot c</math> or <math>\operatorname{d}X \cdot u\ v\ w</math> , the shaded area of Figure 4 indicates the models of the difference proposition <math>\operatorname{d}q \cdot u\ v\ w</math> , specifically:
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written dX.c or dX.uvw, the shaded area of Figure 4 indicates
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the models of the difference proposition Dq.uvw, specifically: