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Determinacy of smooth germs with real isolated line singularities
Authors:Bohao Sun  Leslie C Wilson
Institution:Department of Mathematics, University of Hawaii, Honolulu, Hawaii 96822

Leslie C. Wilson ; Department of Mathematics, University of Hawaii, Honolulu, Hawaii 96822

Abstract:

The germ of a smooth real-valued function on Euclidean space is called a real isolated line singularity if its singular set is a nonsingular curve, its Jacobian ideal is \Lojasiewicz at the singular set, and its Hessian determinant restricted to the singular set is \Lojasiewicz at 0. Consider the set of all germs whose singular set contains a fixed nonsingular curve $L$. We prove that such a germ $f$ is infinitely determined among all such germs with respect to composition by diffeomorphisms preserving $L$ if, and only if, the Jacobian ideal of $f$ contains all germs which vanish on $L$ and are infinitely flat at 0 if, and only if, $f$ is a real isolated line singularity.

Keywords:Non-isolated singularities  line singularities  infinite determinacy  Lojasiewicz inequality
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