Primitive of Pointwise Sum of Functions/Examples/u+v+w

Examples of Use of Primitive of Pointwise Sum of Functions
Let $u$, $v$ and $w$ be real functions of $x$ which are integrable.

Then:
 * $\ds \int \paren {u + v + w} \rd x = \int u \rd x + \int v \rd x + \int w \rd x$

Proof
This is an instance of Primitive of Pointwise Sum of Functions:


 * $\ds \int \map {\paren {f_1 \pm f_2 \pm \, \cdots \pm f_n} } x \rd x = \int \map {f_1} x \rd x \pm \int \map {f_2} x \rd x \pm \, \cdots \pm \int \map {f_n} x \rd x$

where $u = f_1$, $v = f_2$ and $w = f_3$.