For $\alpha\in A_{c}^{n,n}(W)$, the following properties hold:

• (a)

  If $U$ is a very affine chart of integration for $\alpha$, then every non-empty very affine open subset $U^{\prime}$ of $U$ is a very affine chart of integration for $\alpha$.

• (b)

  The definition of $\int_{W}\alpha$ is independent of the choice of the very affine chart of integration for $\alpha$.