TY - JOUR PB - Seccio de Matematiques i Informatica, E.T.S. d'Arquitectura, Universitat Politecnica SN - 1134-5632 A1 - Foschi, Rachele A1 - Spizzichino, Fabio N2 - 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 SP - 95 Y1 - 2008/// TI - Semigroups of Semi-copulas and Evolution of Dependence at Increase of Age AV - none JF - Mathware & Soft Computing IS - 1 UR - http://ic.ugr.es/Mathware/index.php/Mathware/article/viewFile/35/20 VL - 15 ID - eprints705 EP - 111 ER -