(?)abc? ???rs U i+1 = (a)c s? n = 0 ?t U i+1 = ((b)x n?1 ,
c )d (0 ? l ? n ? 1)? ???rs U i+1 = (a)d s? l = 0 ?t U i+1 = ((b)x l?1 ,
LM ) ?t (LI)? ????t??t ???s? ???? ??s ????r?t???s ?? ?? s??r??t s?r q?????s ??r????s ??s r??s ,
??? ???ss?q??? ??s ??r????s s?????t?s (X m ? X c ) ? (X c ? X i ) ?t (X c ? X m ? X i ) ? (X m ? (X c ? X i )) s??t ?é???tr????s? ?? ,
A s? ? ? A ?st ?ér?????? s??s ?t???s?r ??s rè???s (? i ) ?t (? c )? ?? rés??t?t s?????t ?t?é?rè ,
A) ?t ???r t??t? ??r????? X q?? ?? ??r??t ??s ???s A? d(X) ,
? ???t s????t d ?t d ? ??s ???? ?é??r?t???s s?????t?s ? d(X) = X c ? d(Y ) = Y i ? d ? (X) = X i ?t d ? (Y ) = Y c ? ?? ?st ?????? ?? ?ér???r q?? d ?t d ? s??t ??s ?é??r?t???s ,
?st??t? H ?q?? r??rés??t? à ?? ???s id ?t J?? ???s ?é???ss??s s?r ??s t?r??s ?? id ?r?s ,
x n ) ??r Ap n (x, x 1 , ..., x n ) ?ù Ap n ?st ?? s? ,
SC 2 ) ?st ????s????? ?? t??t?s ??s ??r????s ?? s????? ?r?r? s?????t?s ? P??r ???q?? ??r???? G t???? q?? F v(G) = {x 1, }? ?? 1 ...?? m [?X n ?x 1 ...?x n (G ? X n (x 1 , ..., x n ))] ?ù X ? F v(G)? ,
?? ?t s????s??s q?? ? kj (X kj j ) = y j (1 ? j ? m)? ?? ? ?st ??? M 1 ?s??st?t?t??? t???? q?? ?(x i ) = a i (1 ? i ? n) ,