http://math.shekou.com , r=r0,
|u(0,q)|<+ (2.27)
*
Fb(q)=a'bcos bq+b'bsin bq,
F(q)2p, bn, n=1,2,3,…,
Fb(q)=a'ncos nq + b'nsin nq.
*
(a)
y=Ct+B=Cln x+D (n=0)
*
R0=c0+d0lnr, l=0;
Rn=cnrn+dnr-n, l=n2(n=1,2,3,…)
|R(0)|<+, dn=0(n=0,1,2,…),
Rn=cnrn (n=0,1,2,…).
*
. , , cos 2t,
*
, , f(t)F(p), f(n)(t)pnF(p)-[pn-1f(0)+pn-2f '(0)+…+f (n-1)(0)]
0, f(t)npnF(p). , .
s1, s2, ..., snF(s)(bRe(s)<b), s, F(s)0,
n.
*
, , x = r cos q, y = r sin q, r,q:

*
*
. (2.59), Wx,
*