?? ??r?s ?? t??t?? ?t??t ????é ?? ??ré ???t?r??? F s?r P n ?? ?é???t s? ???t? µ(F ) = deg(F ) rg(F ) ? ?? ??ré ???t?r??? E ?st µ?st???? ?r?s?? s????st????? s? ?t s???????t s? ???r t??t s??s????s???? ????rs????, ?? E ?? ? µ(L) < µ(E) ?r?s?? µ(L) ? µ(E)?? ,
?s??s q?? ?? ??r?s ?? ??s? s??t ?? ??r??? tér?st?q?? ?????? ?? l ?st s??s?????t ?é?ér??? ?t ,
f ? k) ???s ?? ??s ?é?ér?q??? ?????s??s q?? codimD k (?) = (e?k)(f ?k) ,
p ?? F q ?? P 2? ??s ?r??t?s ?? s??t ?? E ?é???ss??t ?? s??s?s??é?? ??r? ,
???? ?r?ss??r ??s ???s????? ???ér??ts s????st????s ?? r??? 2 s?r P 2 ?? ???ss?s ?? ???r? c 1 = 0 ?t c 2 = n ? ???st ,
?? s??s?s??é?? ??r?é ??s ???ss?s ?? ???s????? s???????rs ?st ??? ????rs?r???? ???s M (0, n) ??? té? ?M (0, n)? P?r ?? ?r??r?été ???s???? ?? ?????? ?r?ss??r ???s ??t????s ?? ??r???s?? M, ?? P(H 0 (P 2? , O P 2? (n))), [E] ? S(E) ,
d 2 ) ?és???? ?? ??ré ?? ?r??t? s?r C ?? ???ré d? ?t a + b = 2c 1 (E) ,
?t q ??s ?r????t???s s?r P 2 ?t P 5 r?s???t??????t? ???s r?tr?????s ???s? ?? rés???t??? ?? F ???s ???s? ,
(?2) = h 1 E = c 2 ? 1 ?? s????rt ?? R 1 q * p * E ?st ?? ????s??r ?? ???ré c 2 ? 1? ?? ?????s??s ????t????t q?? E s??t ???r? ?? ???s???? q * p * E ?st ?? ???s???? ré????? ?? r??? 2 s?r P 5 ? ?? ?r???èr? ???ss? ?? ???r? ?st ?c 2 ? ?? ???t? ???s??ér??s ?? s??t? ????t? s????? ,
???rs ?? l 1 ? l 2 ?st ??? ????q?? ?? s??t s? ?t s???????t s? ?? ????s ??? ??s ???? ?r??t?s ?st s??t??s? ???r E? ?? l 2 ?st ??? ????q?? ?? s??t s? ?t s???????t s? l ?st ?? ,