322 E. D'OVIDIO 



Ordini 4, 4. 



{l,lé)\={hléyKl\-\{h,n{xy); 



{h, i')\= {Jc i^f ij IL léy -\{Ti, J''Y (^ y) , 



{/e, l^)\, = {k léf kj k';- {k, }^)\ {X y) - \ (/.■, iJy {X yf 



= {kk'Y k, k'^ kyk'y+ g (/.-, l'Y [xyY ; 

 (/.-, k')y = {k h') kj k'J léy - I {k, k'Y {xy) 



= {kk')k,'k'Jky-\-\{k,k'f{xy), 

 {k,h%,={kk') kjk!^ k\^-{k,Jé)\{xy)-^{k, l^f {xyY 



= {kk') kj k'J ky k'y-^^{k, k'Y {xyY , 



{kk')y = k,''k'Jk'y-l{k,k'){xy), 



{kk%, =kJk'Jk';-{k,k\{xy)-^{k,k!Y{xyY=- > 



( kk%, = kj k\. /.■'/- 1 {k, k%, {xy)-^^{kJéYA^y)-l{k, ky {xyY , 



{kk%,=k,'l'y'-2{k,k^)y\{xy) - ^ (A-, //)V. {xyY 



-\{k.VYy{xyY-{{k.n{^y)'' 



Ordini 6, 4. 



( A AO^ -= (a i^r «.Ve, - 1 (/•, /^r (:r i/) = (a Zf «..V., a, + ^ (/•, A;)* (:r 2/) , 



(/■, k)\^ ■= {a kY aj ciy ky - ^ {f, k)y' {x y) ; 



(/; l^y = {<il^a^kJy^{fJcY{xy) = {alcYaJk^ay^y,lcY {xy) , 



(/•, kYy, ■= {a w < K' - 1 (A Wy {^y)-l {f> ^' {^yf 



= {akYaJk^ayky~^{f,kYy{xy) — ^{f,kY{xyY 

 := {a JcYaJkJa;^ | {f, kYy{xy) - ^ (A /.)* {xyY. 



