nitroglycerin
发表于 2025-3-30 10:33:12
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支架
发表于 2025-3-30 13:21:56
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Serenity
发表于 2025-3-30 19:59:15
lds . and ., and some “singularity type” (.) of local smooth maps: .; ℝ. → ℝ., find conditions for a homotopy class .: . → . such that no smooth map . of the class . exhibits the singularity (.). Following Ehresmann’s theory of jets, one may associate to any singularity of type (.) a set of orbits f