On topological, Lipschitz and uniform classification of LF-spaces
P. Mankiewicz (1974)
Studia Mathematica
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P. Mankiewicz (1974)
Studia Mathematica
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P. Mankiewicz (1972)
Studia Mathematica
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Tomás Domínguez Benavides (1980)
Collectanea Mathematica
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Iryna Banakh, Taras Banakh, Anatolij Plichko, Anatoliy Prykarpatsky (2012)
Open Mathematics
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We find conditions for a smooth nonlinear map f: U → V between open subsets of Hilbert or Banach spaces to be locally convex in the sense that for some c and each positive ɛ < c the image f(B ɛ(x)) of each ɛ-ball B ɛ(x) ⊂ U is convex. We give a lower bound on c via the second order Lipschitz constant Lip2(f), the Lipschitz-open constant Lipo(f) of f, and the 2-convexity number conv2(X) of the Banach space X.
J. Grzybowski, D. Pallaschke, R. Urbański (2007)
Control and Cybernetics
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P. Mankiewicz (1973)
Studia Mathematica
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Luděk Zajíček (1983)
Czechoslovak Mathematical Journal
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