— 28 — 
31. (Y.f?>«)) (2,2,1,2) 
B2. {XA?,'^)Y . (2,2,1,0) 
sa. (Y,(/'^,«f) ' (2,2,1,2) 
34. {X,{k,wy-y (2,2,1,0) 
35. (xpY (2,2,1,0) 
36. (Y,(fc,Q)?*) (2,3,1,1) 
B7. (Y , C7) (2,3,1, 1) 
38. (y , , pY) (2,3,1,1) 
89. (Y,(«',ir)) <'2,3,1,1) 
40. (Y,(Q,it))* **) ' (2,4,1,0) 
41- (YP)(Y3) (2,4,l,0j 
42. (kw)- {he') (kx) (u'y) (2,4,1, 0) 
43. (Y2')(Y*) (2,4,1,0) 
44. (M(^P)i^Xn. (2,5,1,1) 
45. (wa) («-■y)y^ (2,6,1,1) 
46. (n)(^-'-)(^Y) (2,6,1,0; 
47. (Y*)' (2,6,1,0) 
48. (Y9) (Y*) (2,6,1,0) 
49. (ws) (xw) (y«) (2 , 8 , 1 , Oj 
IV. Forme di 3.° grado in «. 
50. (y , T)' ***) (3,0,1,4) 
51. (TP)«(TY)T,^Y. (3,1,1,3) 
52. (TP)'(Ty)^T,. (3,1,1,1) 
63. (T«)^(Ty)^V (3,2,1,2) 
54. (W(fT)^(p'YjT,Ya.- (3,2,l,2j 
55. (PT)' (P'T)' (PV) (Ty) (3,2,1,0) 
56. (n)(n) (3,2,l,0j 
57. (TQ)»(Ty)VT. (3,3,1,3) 
58. (TQ)''(Ty)*T^ (3,3,1,1) 
69. (pi))(pn)OY)Y.,- (3,3,1,1) 
60. lPT)'(Tt/)^(TY)Y,,. (3,3, 1,1 j 
61. (5Y) («Y) (3,4,1,0) 
62. (..Y) (iTY) (3,4,1,0) 
63. (aY)^n) (3,4,1,0) 
64. {^p)'(^r)(pr) (3,4,1,0; 
65. {w'r:){wx)(px) (3,4,1,0) 
66. i^n) (^s) (Py)Y. (3,5,1, 1) 
*; La prima spinta è da trascurarsi in forza del teorema dimostrato. 
**) Id. id. 
***) Nel sistema completo di una biquadratica e quadratica in luogo di questa spinta si suol 
considerare la (/e, (y , «)') che è una sua parte — V. Clebsch, Th. d. b. alg. Formen, p. 213. 
'****) La ],rima spinta su y ^ da trascurarsi come sopra. 
