Abstract:
Singularities of functions of modality 1 or 2 were classified by Arnold [3]. Types of those of modality 3 were listed in [14]. Here we show that these are all Newton non-degenerate in the extended sense introduced in [17], and use this fact to obtain explicit regular bases and precise normal forms for right and for contact equivalence. This requires care since the only existing method for non-semiquasihomogeneous germs (using Arnold's “Condition A”) does not apply to all our cases.
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Received: 8 February 1999 / Revised version: 28 May 1999
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Wall, C. Notes on trimodal singularities. manuscripta math. 100, 131–157 (1999). https://doi.org/10.1007/s002290050232
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DOI: https://doi.org/10.1007/s002290050232