getAnisotropicDimension beta
By the Witt Decomposition Theorem, any non-degenerate form decomposes uniquely as $\beta \cong n \mathbb{H} \oplus \beta_a$ where the form $\beta_a$ is anisotropic. The rank of $\beta_a$ is called the anisotropic dimension of $\beta$.
The anisotropic dimension of a form defined over the rational numbers is the maximum of the anistropic dimension at each of the completions of $\mathbb{Q}$.
The object getAnisotropicDimension is a method function.
The source of this document is in A1BrouwerDegrees/Documentation/AnisotropicDimensionDoc.m2:35:0.