fulltext[1].pdf

of : 393,02, 1991, 393 9 1991 in . . d22, , 25000 19 989; in 5 990) in of be if it is to of a a us to of a a by an is of to a at to O. to in AD of In a of to be of a of in or or by In it to us to be to at by We us to be it is to at a 1. y of k, at a k - 2) 1, 3, 4, 6. t to be to AD 62 3. 394 P. T s t to us to be of 6s 8 0) t to a to a in a is a k (k + 1); k - 1) at of It us to a of of to a in It to be of of in is to of s we a a of a to to a in by 2 s f, in we a as j, we as In to we C to in a of P, 9 . 9 , P,+2, , of a on C s 4, 5, 6): 3 Q,(u) = N(u) (r=0 u is No(u), Nl(u), N2(u), N3(u) 9 1 4 1 0 3 0 l,u,u 2, -(1/6) 3 0 1 3 (95 , + 4-/+, + /+2 P, + 3./+2 Q,(u) = + u + 6 6 3/ - 6P/+l + 3+2 + 6 + 3./+1 - 3./+2 + /+3 u 3 (6 1) of by he a of to of (be 3, 5.) C us to of we l = P4 , we j = Q(0) = Pj 2 = ) = ( 6. 97 It is to is is a , of is In it be = we a 12 a . of = G, we (i) on a or a (be of (to u is to on be it is to of or be to by of is at is to be to a an at It to be C an be as by C at at he C us to of to 5 if of is 0, on is 0 5. by a of it is to a of a Qi(u) = u , A, as 398 P. T 2. n of of it is to in to a In of a by C of of of s of a of be in + G D 0, 1. (B, G, D an O, X, Y, Z) , u) k , I by a to of u of u of be to a S u S We of is i In to we i , A, B, C, D i, A, B, G, D. s Q(u) = (B + 2uC + 3u 6u + (C + 3uD)( + O(6u) 3. (If we t us we by a Q(= (B + 2 + 3D)6 (C + 3)(6u,) 2 + D.(3, ( Y. O, u 1, j=o of of u of 99 In 3 to is x/(z + (62 + (62 6Q ( 2 39 ( 3 (6u,) 2 + + (3, ( 2 3u 2 au k + ( 3 9 (2 + + (3, ( 2 3u- ( 3Z). (2 + + (3. (a an of th u: (2 = E-(6 + F. (s + G ( 4 - H (3 + K (2, = F = (2 + (z + (2, 2. ( + 6. (2 + + (2 + (DZ) = (2 + 2 (+ 10. ( 15. (2- (2 + + (2 + 2. (+ 10- ( 15. (2 (2 + + (2 + 2. (+ 10. ( 15. (2- (2, H = K = (2 (+ 4. (2 + 6 ( . 18- (. (2 + + 18. (2- (3 + 2. (+ 4. (z + 6 ( + 18 ( (2 + 18 (2 (3 + 2 (+ + 4 (2 + 6 (, 18 ( (2 + + 18. (2 (3, (2 + 4. ( 4 (2 + 6 ( (2 + + 12. ( (3 + 9. (2 (u) + (2 + 4. ( + 4-(2 + 6. (.(2 + 12-(u) 3 + + 9 (2. (4 + (2 + 4 ( + 4 (2 + 6 (Z) (2 + + 12 ( (3 + 9 (2 (4, 400 P. T F F u e of (i) t = tk u is u k+J ; ( - Uk l 6tk a (), is v of of of is s be S k = v k 9 ct k. (A to vk k 0, N, of of of Sks by Sks it is to of us by If we = 6t k, it is uk us to Sks, of In to we as 7. is it to a is to we an (i) of of (of of of u of to (of us of in a he to to Q Yk 01 to of in u is at is to an ,Zk s is to is (6u) 3 at It be in of a if of Uk of on is (6u) 2 + 2i a s is to R1 is is K1 i(6u) + li a on of a as a of of ,Su R1 is u. R2 be as a u of us ! /(to be t 1 Z 8u I I ,1 1. on a 2 402 P. T is by of So if we to it is to s so we by to 3. he C us to by in a an be in C in a 6s is no in C In be by t k to s to be in so it is to . C., A 1978). 2. P., 1972). 3. R., to of 1973). 4. 3, 171982). 5. et dun de fi de 1986). 6. 9, 5641986). 7.