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Vrkoč, Ivo
The class of functions fulfilling the inequality $\Vert f(x+z)-f(x)-f(y+z)+f(y) \Vert \le \Vert x-y \Vert \omega(\Vert z \Vert)$. (English). Czechoslovak Mathematical Journal, vol. 19 (1969), issue 3, pp. 500-514
MSC: 46.45 | MR 0247466 | Zbl 0186.47602 | DOI: 10.21136/CMJ.1969.100917
References:
[1] Kurzweil J.: Exponentially Stable Integral Manifolds, Averaging Principle and Continuous Dependence on a Parameter. Czech. Math. J. 16 (91) 1966, 380-432. MR 0206440 | Zbl 0186.47701
[2] Yosida K.: Functional Analysis. Springer Verlag, Berlin 1965. Zbl 0126.11504
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