similarity definition between two sets with the different cardinality

*To*: mathgroup at smc.vnet.net*Subject*: [mg49901] similarity definition between two sets with the different cardinality*From*: cele.li at eyou.com (cele)*Date*: Thu, 5 Aug 2004 09:22:14 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Thanks any advices in advance. Given two itemsets T={i1,i2,¡,im}, T¡¯={j1,j2,¡,jn}, m¡Ùn also know the distance between any pair of elements from T and T' separately. how to define the similarity between T and T'?