Adaptation

It is possible to adapt the problem while generating the fold curve. This call updates the auxiliary variables used in the defining system of the computed branch. The bordering vectors $v_{bor}$ and $w_{bor}$ may require updating since they must at least be such that the matrices in (56) and (57) are nonsingular. Updating is done by replacing $v_{bor}$ and $w_{bor}$ by the normalized vectors $v, w$ computed in (56) and (57) respectively.