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Publication:3322889
zbMath0537.58016MaRDI QIDQ3322889
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Publication date: 1983
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Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces (58E05) Critical points and critical submanifolds in differential topology (57R70) Theory of singularities and catastrophe theory (58K99) Differentiable maps on manifolds (58C25)