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# Quartic differential forms and transversal nets with singularities

• We consider a class $\mathcal{Q}(M) \,$ consisting of smooth quartic differential forms which are defined on an oriented two-manifold $M$, to each of which we associate a pair of transversal nets with common singularities. These quartic forms are related to geometric objects such as curvature lines, asymptotic lines of surfaces immersed in $\R^4.$ Local problems around the rank-2 singular points of the elements of $\mathcal{Q}(M) \,$, such as stability, normal forms, finite determinacy, versal unfoldings, are studied in [2]. Here we make a similar study for a rank-1 singular point that is analogous to the saddle-node singularity of vector fields.
Mathematics Subject Classification: Primary: 53A07, 58D10; Secondary: 37G10.

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