Geodesic
$\alpha$-accessible domains, a~nonsmooth case
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 13 (2013) no. 3, pp. 3-8.

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This paper continues the study of $\alpha$-accessible domains in $\mathbb R^n$. They are starlike domains and satisfy cone condition which is important for applications. Conditions of $\alpha$-accessibility of domain, defined by the inequality $F(x)0$, is obtained for a continuous function $F$ in $\mathbb R^n$. Thus these conditions are written in the form of inequalities for the directional derivatives; necessary and sufficient conditions differ only in the sign of equality in these inequalities. We obtain new results even in the case where $\alpha=0$ (the case of starlike domains). 
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K. F. Amozova; V. V. Starkov. $\alpha$-accessible domains, a~nonsmooth case. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 13 (2013) no. 3, pp. 3-8. http://geodesic.mathdoc.fr/item/ISU_2013_13_3_a0/

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