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610 bytes added
, 02:52, 17 June 2009
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| <math>\text{Figure 24-1. Proposition}~ pq : X \to \mathbb{B}</math>
| <math>\text{Figure 24-1. Proposition}~ pq : X \to \mathbb{B}</math>
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{| align="center" cellspacing="10" style="text-align:center"
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| [[Image:Field Picture PQ Tacit Extension Conjunction.jpg|500px]]
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| <math>\text{Figure 24-2. Tacit Extension}~ \varepsilon (pq) : \operatorname{E}X \to \mathbb{B}</math>
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<math>\begin{array}{rcccccc}
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\varepsilon (pq)
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& = & p & \cdot & q & \cdot & (\operatorname{d}p)(\operatorname{d}q)
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\\[4pt]
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& + & p & \cdot & q & \cdot & (\operatorname{d}p)~\operatorname{d}q~
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\\[4pt]
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& + & p & \cdot & q & \cdot & ~\operatorname{d}p~(\operatorname{d}q)
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\\[4pt]
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& + & p & \cdot & q & \cdot & ~\operatorname{d}p~~\operatorname{d}q~
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\end{array}</math>
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