Equidistant functions are studied using spherical approximations to one focal set, with necessary and sufficient conditions given for existence along vertical lines and a commuting property with the minimum operator.
Polyellipses and optimization, Quart
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On a special class of equidistant sets in the Euclidean space
Equidistant functions are studied using spherical approximations to one focal set, with necessary and sufficient conditions given for existence along vertical lines and a commuting property with the minimum operator.