an:04073407
Zbl 0657.31010
Medkov??, Dagmar
Note on contractivity of the Neumann operator
EN
??as. P??stov??n?? Mat. 112, 197-208 (1987).
00178756
1987
j
31B20
generalized normal derivative; perimeter; hit; Neumann operator; space of signed measures; non-convex; contractiv
The paper deals with the Neumann operator on the space of signed measures on boundary, for which the measure of the whole space equals zero. An example of a set, the complement of which is a non-convex bounded set, and at the same time the corresponding Neumann operator is contractiv on this space, is shown.