→Note 7: write a few symbols out for ease of reading
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\operatorname{E}f(x, y, \operatorname{d}x, \operatorname{d}y)
\operatorname{E}f(x, y, \operatorname{d}x, \operatorname{d}y)
−
& = &
+
& = &
f(x + \operatorname{d}x, y + \operatorname{d}y).
f(x + \operatorname{d}x, y + \operatorname{d}y).
\end{array}</math>
\end{array}</math>
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Evaluating <math>\operatorname{E}f</math> at particular values of <math>\operatorname{d}x</math> and <math>\operatorname{d}y,</math> for example, <math>\operatorname{d}x = i</math> and <math>\operatorname{d}y = j,</math> where <math>i, j \in \mathbb{B},</math> leads to the following result:
+
Evaluating <math>\operatorname{E}f</math> at particular values of <math>\operatorname{d}x</math> and <math>\operatorname{d}y,</math> for example, <math>\operatorname{d}x = i</math> and <math>\operatorname{d}y = j,</math> where <math>i\!</math> and <math>j\!</math> are values in <math>\mathbb{B},</math> produces the following result: