A complete system of isotopy invariants is proven for Morse polynomials of degree ≤4 over the reals, with explicit realization of all 71 classes for degree 4 and a count of maximal-critical-point classes up to reflection.
Sedykh, On the topology of stable Lagrangian maps with singularitie s of types A and D, Izvestiya: Mathematics, 79: 3 (2015), 581–622
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Isotopy classification of Morse polynomials of degree 4 in ${\mathbb R}^2$
A complete system of isotopy invariants is proven for Morse polynomials of degree ≤4 over the reals, with explicit realization of all 71 classes for degree 4 and a count of maximal-critical-point classes up to reflection.