FORMA BINARIA DEL SEST'OEDINE à2rl 



{f\k)%,= {akf aj a, hy- (f, h)\, (xy)-'^ {t\ k)\ {xyy 



1 3 



= («A)- a,- k, (ly-ky - 3 {f,kYyi{xy) + ^^{f,1i)\{xy)- ; 



{t\k)y ^ {ak) ajkjky - l if, kV- (xy) = (a k) a^%h,y-^ ^ {f,ky- (xy), 

 {f,k\,= {ak)ajkjy-l{t\k)\{xy)-f^{f,kf{xyr 



= [a k) aj kj Gy A-, - 1 1 /; k)\ {x y) + ^^ [f. Af {x y)\ 

 {f,k%,= {ak)a,'k;-^-^{fJc)\,{xy)-^^{f^f,{xyy-^^{^^^ 



{f,k)y,= {ak)ajayk;- 1 {m\z{xy)- ^ {fMyÀxyY- \ if, k^xyy, 

 {fk)y = a^Vky- 1 (/; k) {x y) = a/ k,' a, + = {/; k) {x y), 

 {fk)y, = ajkjky- l (/; k)y (xy) - '^, (/. ky {xyy= ... , 



(/■A),3 = «/ A-, V- 5 {/' f^)y^ i^y) - ì (/• ^')y' i^ V^'-'u </"' ^^ 1^^)' ' 



-i{f,kyy{xyy = ... 



Ordini 8, 4. 



(A, kYy = {h ky hj A, - 1 {h ky (x y) = {h ky hj a-., Z^, + i (/^ A-)^ (x y) , 



(fe,A;)%-= {hkyK'h, ky- I (/^A•)^,(a;y)=(^A;)'VA:,V+ ^ (;^ A)^, [xy). 



{Kkyy,= {hkYhJhyH-y-Uh.k)\,{xy) ; 



(//, A-)v = (/^ A;)^ hj A-., A, -| (/^ Af (.^7/) = {hky-hjkjky+ ^ (/^Af (ì;^), 



(A, ky^,= {h ky hj ky - 1 [h kyy{J:y)-'^ {k , ky {xyy = ..., 



{h, k)\,= [h ky hj K ky-~l [h , k)%, (^..y) - .g (/^ k)\ [x yy=..., 



{h, k)\,= [h ky hj V V - 1^*' ^)'.3 [^ y) - \ (^^ Wy^ i^yy- = - ; 



