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\end{array}</math>
 
\end{array}</math>
 
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Second, the ''difference map'' (or the ''chordal transformation'') <math>\operatorname{D}G = (\operatorname{D}G_1, \operatorname{D}G_2) : \operatorname{E}U^\circ \to \operatorname{E}X^\circ</math> is defined in a component-wise fashion as the boolean sum of the initial proposition <math>G_j\!</math> and the ''enlarged'' or ''shifted'' proposition <math>\operatorname{E}G_j,</math> for <math>j = 1, 2,\!</math> in accord with following pair of equations:
    
<pre>
 
<pre>
Second, the "difference map" (or the "chordal transformation")
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DG = <DG_1, DG_2> : EU% -> EX% is defined in a component-wise
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fashion as the boolean sum of the initial proposition G_j and
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the enlarged or the "shifted" proposition EG_j, for j = 1, 2,
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in accord with following pair of equations:
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DG_1  =  G_1 <u, v>  +  EG_1 <u, v, du, dv>
 
DG_1  =  G_1 <u, v>  +  EG_1 <u, v, du, dv>
  
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