Changes

We have just met with the fact that the differential of the '''''and''''' is the '''''or''''' of the differentials.

We have just met with the fact that the differential of the '''''and''''' is the '''''or''''' of the differentials.

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<math>p ~\operatorname{and}~ q \quad \xrightarrow{~\operatorname{Diff}~} \quad \operatorname{d}p ~\operatorname{or}~ \operatorname{d}q</math>

<math>p ~\operatorname{and}~ q \qquad \xrightarrow{~\operatorname{Diff}~} \qquad \operatorname{d}p ~\operatorname{or}~ \operatorname{d}q</math>

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

|                                     o  o      |

|        @          --Diff-->          @        |

|        p q        --Diff-->    ((dp) (dq))   |

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