Codimension-one bifurcation classification conjecture for one-fast, two-slow critical sets
Let define a critical set for a system with one fast variable and two slow variables. Let denote the listed degeneracy subsets, with a slow-variable value.
Codimension-one bifurcation conjecture. The codimension-one bifurcations of critical sets are characterised by the stated classification: precisely one set is non-empty, for precisely one , and precisely one of the following occurs: a loop or pair of hyperbolae appears in the fold projections at a fold tangency ; two cusps annihilate at a cusp tangency ; a quadratic fold line folds over to form two cusps in a swallowtail ; the projections of two quadratic fold curves become tangent at ; the projections of a quadratic fold curve and a cubic cusp intersect at ; or the projections of three fold lines intersect at .
This is a proposed classification of codimension-one bifurcations in the one-fast, two-slow case, analogous to the preceding one-fast, one-slow classification. The source provides no evidence that the classification has been proved or refuted.
References
Primary source
Karl Nyman, Peter Ashwin and Peter Ditlevsen, “Bifurcation of critical sets and relaxation oscillations in singular fast-slow systems”, arXiv:1902.09203 (2019).
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