Abstract
Necessary and sufficient conditions are given in order to ensure that a function δ:[0, 1] → [0, 1] is the diagonal section of an absolutely continuous copula. Explicit constructions are provided.
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Acknowledgments
The authors are grateful to the Associate Editor and anonymous reviewers for their comments and useful suggestions. The first author acknowledges helpful discussions with Peter Sarkoci (Department of Knowledge-Based Mathematical Systems, Linz, Austria). This work was partially supported by the project “Copula Theory and its Applications”, bilateral cooperation Austria-Poland (WTZ, project PL 03/2008).