) ? ??s ?????s ?? K s??? ???st? ?? ??t??r d 0 ? N t?? q?? ???r t??t?s ?r?s?? ?r?sq?? t??t?s? ??s ?????s v ?? ,
r? w ?? r?s? tr??t??? ?? w à L i\a ? ????t??s??? k(? a,i )/k ét??t t?t??????t r????é? ??? ??ss?s ?? a? ?? ? [k va (? a,i ) : k va ] = p? ????tr? ??rt? ????t??s??? L i\a ,