12 



By adding to n terms with arbitrary parameters a 7 £ and a 8 § 8 , a manifold 

 r? 1 = ?? + a ? £ 7 + a g £ 8 is obtained. 



The polynomial [4c] is completely defined by the four geometrical 



parameters 



1 ) <t> 



2) t s =- 

 3>7 a (0] 



\ 



arjfi) 



*0 



a* 



'* 



= _ a t* = -t 



i a a 



[5] 



/ 



pressed by 



where 



When T) has to comply with the four equations [5] it can be ex- 



\ = "o + C bV<*> + C aV ( * ] 



complies with the conditions 



I" 1 4 J7(*)d§ = 0; 



Jo 3 



[6] 

 [6a] 



and 



dA 77(0) 64 77(1 ) 



V (pL- V (i)--J r ---JL_-o 



4 7j(D = * 3 n - r 



[6b] 



satisfies 



A 7,(0) = 4 tj(1) =— ± 



4 4 C 5 



54 r/(0) dA ij(l 



a* 



= 



Thus, an addition of the functions A , A to 77 does not influence the 



3 4 



boundary conditions, [5]. The shape of the curves A 77(5) and A ri($) is 

 shown in Figure "13- The advantage of this representation is obvious. 

 While in the equations 



' = "s + "a 



//*(!) = //§(*) +/i*(0 



