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They classify the so called "simple singularities" of differential maps, that is, of those types of singularities which involve no parameters. See V. I. Arnolʹd, S. M. Guseĭn-Zade, A. N. Varchenko, Singularities of differentiable maps, Vol. 2, Chap. 15, sect. 1.

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They classify the so called "simple singularities" of differential maps. See V. I. Arnolʹd, S. M. Guseĭn-Zade, A. N. Varchenko, Singularities of differentiable maps, Vol. 2, Chap. 15, sect. 1.