Solution
= Solution
Regularity at infinity excludes the <natural logarithm> and every positive radial power. Thus
$$
\boxed{c_0=0,\qquad a_n=b_n=0\quad(n\geq1)}.
$$
The constant $a_0$ and the decaying coefficients $c_n,d_n$ remain arbitrary.
= Solution
Regularity at infinity excludes the <natural logarithm> and every positive radial power. Thus
$$
\boxed{c_0=0,\qquad a_n=b_n=0\quad(n\geq1)}.
$$
The constant $a_0$ and the decaying coefficients $c_n,d_n$ remain arbitrary.