Changes

In the example <math>f(p, q) = pq,\!</math> the value of the difference proposition <math>\operatorname{D}f_x</math> at each of the four points in <math>x \in X\!</math> may be computed in graphical fashion as shown below:

In the example <math>f(p, q) = pq,\!</math> the value of the difference proposition <math>\operatorname{D}f_x</math> at each of the four points in <math>x \in X\!</math> may be computed in graphical fashion as shown below:

{| align="center" cellspacing="10" style="text-align:center; width:90%"

{| align="center" cellspacing="20" style="text-align:center; width:90%"

| [[Image:Cactus Graph Df = ((P,dP)(Q,dQ),PQ).jpg|500px]]

| [[Image:Cactus Graph Df = ((P,dP)(Q,dQ),PQ).jpg|500px]]

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| [[Image:Cactus Graph Df@PQ = ((dP)(dQ)).jpg|500px]]

| [[Image:Cactus Graph Df@PQ = ((dP)(dQ)).jpg|500px]]

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| [[Image:Cactus Graph Df@P(Q) = (dP)dQ.jpg|500px]]

|                        @                       |

| Df|p(q) =         (dp) dq                      |

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