relation: http://eprints.imtlucca.it/705/ title: Semigroups of Semi-copulas and Evolution of Dependence at Increase of Age creator: Foschi, Rachele creator: Spizzichino, Fabio subject: QA Mathematics subject: QA75 Electronic computers. Computer science description: We consider a pair of exchangeable lifetimes X, Y and the families of the conditional survival functions F t (x, y) of (X − t, Y − t) given (X > t, Y > t). We analyze some properties of dependence and of ageing for F t (x, y) and some relations among them publisher: Seccio de Matematiques i Informatica, E.T.S. d'Arquitectura, Universitat Politecnica date: 2008 type: Article type: PeerReviewed identifier: Foschi, Rachele and Spizzichino, Fabio Semigroups of Semi-copulas and Evolution of Dependence at Increase of Age. Mathware & Soft Computing, 15 (1). pp. 95-111. ISSN 1134-5632 (2008) relation: http://ic.ugr.es/Mathware/index.php/Mathware/article/viewFile/35/20