Matrix Factorization and Latent Semantic Indexing Problems with Lexical semantics Synonymy: Different terms may have an identical or a similar meaning weaker words indicating the same topic No associations between words are made in the vector space representation simt(d,g)>cos(∠(,)Matrix Factorization and Latent Semantic Indexing 28 Problems with Lexical Semantics ▪ Synonymy: Different terms may have an identical or a similar meaning (weaker: words indicating the same topic). ▪ No associations between words are made in the vector space representation. LSI