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In the toolbox branch point curves are computed by minimally extended defining systems,
cf. [27], § 4.1.2.
The branch point curve is defined by the following system
where (u,a) Î Rn+2, while g1 and g2 are obtained by solving
N4 |
æ ç ç
ç è
|
|
ö ÷ ÷
÷ ø
|
= |
æ ç ç
ç è
|
|
ö ÷ ÷
÷ ø
|
. |
| (84) |
Here v11 and v21 are functions and v12,v22,g1 and g2 are scalars and
where the bordering functions v011,v021,w01 and scalars v012,v022 are chosen so that N4 is nonsingular. This method is implemented in the curve definition file branchpoint.m.