## The Calculus Primer (2011)

### Part VII. Differentials

### Chapter 26. USING DIFFERENTIALS

**7—5.Differential Notation.** The standard formulas for differentiation can now be expressed in differential notation, as given below. For example, instead of writing

The relation, “the derivative with respect to *x* of a constant equals zero,” may also be stated as “the differential of a constant equals zero.”

Similarly,

becomes*d*(*u + v*) = *du* + *dv*.