ISR10 Introduction chapter Joseph John Rocchio Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. 1-9 * [OCRerr]dm[OCRerr] be the set 0£ source document im[OCRerr]s and be the set 0£ query index ima[OCRerr]es. 4) Let V represent the index la[OCRerr][OCRerr]e, an n-dimensional vector space defined as the range of the transformation T. An index image. d may, therefore, be written: d=d v + d V + *.. + d V 1 1' 2 2 n n where the d., i = 1 ,n are the scalar wei[OCRerr]hts assigned 1' to the orthogonal unit vectors v½' i = l,n which constitute the basis of the index langnage vector space[OCRerr] 5)' Let' [OCRerr] be `the se'arch request - source document matchi'*ng function from which the retrieved orderi[OCRerr] is derived; [OCRerr] is then a functio'n from the couple (q,d)., q E [OCRerr], d E I to the,real[OCRerr]line. ` -.