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|}
 
|}
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<pre>
   
Thus we have a pictorial way of visualizing the following data:
 
Thus we have a pictorial way of visualizing the following data:
   −
  !e![pq]
+
{| align="center" cellspacing="10" style="text-align:center"
 
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|
    =
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<math>\begin{array}{rcccccc}
 
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\varepsilon (pq)
    p q . dp dq
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& = & p & \cdot & q & \cdot & (\operatorname{d}p)(\operatorname{d}q)
 
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\\[4pt]
    +
+
& + & p & \cdot & q & \cdot & (\operatorname{d}p)~\operatorname{d}q~
 
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\\[4pt]
    p q . dp (dq)
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& + & p & \cdot & q & \cdot & ~\operatorname{d}p~(\operatorname{d}q)
 
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\\[4pt]
    +
+
& + & p & \cdot & q & \cdot & ~\operatorname{d}p~~\operatorname{d}q~
 
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\end{array}</math>
    p q . (dp) dq
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|}
 
  −
    +
  −
 
  −
    p q . (dp)(dq)
  −
</pre>
      
==Note 25==
 
==Note 25==
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