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→‎Note 24: segment text + set off graphics
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as a scalar field, in effect, a potential "plateau" of elevation 1
 
as a scalar field, in effect, a potential "plateau" of elevation 1
 
over the shaded region, with an elevation of 0 everywhere else.
 
over the shaded region, with an elevation of 0 everywhere else.
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{| align="center" cellspacing="10" style="text-align:center; width:90%"
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o---------------------------------------------------------------------o
 
o---------------------------------------------------------------------o
 
|                                                                    |
 
|                                                                    |
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o---------------------------------------------------------------------o
 
o---------------------------------------------------------------------o
 
Figure 24-1.  Proposition pq : X -> B
 
Figure 24-1.  Proposition pq : X -> B
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Given any proposition f : X -> B, the "tacit extension" of f to EX
 
Given any proposition f : X -> B, the "tacit extension" of f to EX
 
is notated !e!f : EX -> B and defined by the equation !e!f = f, so
 
is notated !e!f : EX -> B and defined by the equation !e!f = f, so
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or scalar field f = pq : X -> B to give the extended proposition
 
or scalar field f = pq : X -> B to give the extended proposition
 
or differential field that we notate as !e!f = !e![pq] : EX -> B.
 
or differential field that we notate as !e!f = !e![pq] : EX -> B.
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{| align="center" cellspacing="10" style="text-align:center; width:90%"
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o---------------------------------------------------------------------o
 
o---------------------------------------------------------------------o
 
|                                                                    |
 
|                                                                    |
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o---------------------------------------------------------------------o
 
o---------------------------------------------------------------------o
 
Figure 24-2.  Tacit Extension !e![pq] : EX -> B
 
Figure 24-2.  Tacit Extension !e![pq] : EX -> B
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Thus we have a pictorial way of visualizing the following data:
 
Thus we have a pictorial way of visualizing the following data:
  
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