Bessel equation
Bessel equation
Bessel equation
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Corollary 2.9.2<br />
1<br />
z ∂z (z m Jm(z)) = z m−1 <br />
Jm−1(z), czyli ∂z + m<br />
<br />
Jm(z) = Jm−1(z),<br />
z<br />
− 1<br />
z ∂z<br />
−m<br />
z Jm(z) = z −m−1 <br />
Jm+1(z), czyli −∂z + m<br />
<br />
Jm(z) = Jm+1(z).<br />
z<br />
Besides, n 1<br />
<br />
− 1<br />
z ∂z<br />
Analogous identities hold for H ± m(z), and Ym(z).<br />
2.10 Half-integral parameters<br />
z ∂z z m Jm(z) = z m−n Jm−n(z),<br />
n z −m Jm(z) = z −m−n Jm+n(z).<br />
<br />
2<br />
J 1(z)<br />
= =<br />
2<br />
J 1 − (z) =<br />
2<br />
H ± 1 (z) =<br />
2<br />
H ±<br />
− 1<br />
2<br />
(z) =<br />
πz<br />
1<br />
2<br />
sin z,<br />
1<br />
2 2<br />
cos z,<br />
πz<br />
1<br />
2 2<br />
π ±i(z−<br />
e 2<br />
πz<br />
) ,<br />
1<br />
2 2<br />
e<br />
πz<br />
±iz