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MyWikiBiz, Author Your Legacy — Tuesday November 04, 2025
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\texttt{~} \operatorname{d}q \texttt{~}
\texttt{~} \operatorname{d}q \texttt{~}
\texttt{~}
\texttt{~}
\end{array}</math>
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{| align="center" cellspacing="10" style="text-align:center"
| [[Image:Field Picture PQ Differential Conjunction.jpg|500px]]
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| <math>\text{Figure 26-1. Tangent Map}~ \operatorname{d}(pq) : \operatorname{E}X \to \mathbb{B}</math>
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<math>\begin{array}{rcccccc}
\operatorname{d}(pq)
& = & p & \cdot & q & \cdot &
\texttt{(} \operatorname{d}p \texttt{,} \operatorname{d}q \texttt{)}
\\[4pt]
& + & p & \cdot & \texttt{(} q \texttt{)} & \cdot & \operatorname{d}q
\\[4pt]
& + & \texttt{(} p \texttt{)} & \cdot & q & \cdot & \operatorname{d}p
\\[4pt]
& + & \texttt{(} p \texttt{)} & \cdot & \texttt{(}q \texttt{)} & \cdot & 0
\end{array}</math>
\end{array}</math>
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