Dans la notation des n"^ 223, 293, la valeur de B est

r{d^)ib'^) — r{d^c'-b) + r{dc')--{d''){ba')-\-{cPcHP) -^2{d'-cb'^a)— {b'^){d'^b'^)—2{dc^ba)-h{dc^b') — {c'~b)\

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INVARIANTS ET COVARIANTS DES QUARTIQUES. 3"]^

OÙ

{(p)-=i dç^d^d^ -!- id^d^d^ — d^dl — d^^dl — d\,

{d^c'^b)-— ^o[<^|(<^4<^2~ d\) + ic^c^{d^d^~ d^d^) + ic^c^{d^d;^ — d\) -\- c\{dQd!, — d\) -\- 2CiC^{d^d.^ — d^d,) -\'C\{d^d,^ — dl)'\ 4- b^-[cl{d^d,^ — dl)-{- Q.c^c^{d^d^^d^d^)

H- 2 Cq C2 {d^ d.^— d\)-\- c\ (<:/o d,^ — d\