IL COVARIANTE STEINERIANO 107 



3" {ahf {ahf a^nj' kj = {H, k), + ^k'=~ (fi + k') , 



10 15 



5° {aby {akf {bkykJk•J={kkykJk:J+lA^=lBk + lA^ , 



ó ^ ó 



{a kf {apf kjpj = {a b)' {a kf {b k'f kj k'J - ^ (a kf- {a If aj kj 



o 



iP.P), = iPp'ìWp.' = {akf (apy k^'pj - ^ ihp), 



(A ^)^ = {a^Ya^HJ^ A,/= \ {abYialfbJ - \aI =-m . 



T {ah)^aAfaJbjAj={H,A)^ + hA = lkA-^-^Ak'-ljp, 



t di lo o 



" = /-(A A)^ + ^ ^ A _ 2 (a bf (aA)2 a/ b^' Aj 



' =ÌA»-j^M-2(if,A).3 



= ^fm-^kA-^AJ^-^Ìlp, 



