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<math>x ~\operatorname{and}~ y \quad \xrightarrow{~\operatorname{Diff}~} \quad dx ~\operatorname{or}~ dy</math>

<math>x ~\operatorname{and}~ y \quad \xrightarrow{~\operatorname{Diff}~} \quad dx ~\operatorname{or}~ dy</math>

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<pre>

<pre>

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<math>f ~=~ xy ~=~ x ~\operatorname{and}~ y ~\Rightarrow~ \operatorname{D}f|_{xy} ~=~ \texttt{((} \operatorname{dx} \texttt{)(} \operatorname{d}y \texttt{))} ~=~ \operatorname{d}x ~\operatorname{or}~ \operatorname{d}y.</math>

<math>f(x, y) ~=~ xy ~=~ x ~\operatorname{and}~ y \quad \Rightarrow \quad \operatorname{D}f|_{xy} ~=~ \texttt{((} \operatorname{dx} \texttt{)(} \operatorname{d}y \texttt{))} ~=~ \operatorname{d}x ~\operatorname{or}~ \operatorname{d}y.</math>

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<pre>

<pre>

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