On Sturm–Liouville equations with several spectral parameters
We give explicit formulas for a pair of linearly independent solutions of ( p y ′ ) ′ ( x ) + q ( x ) y ( x ) = ( λ 1 r 1 ( x ) + ⋯ + λ d r d ( x ) ) y ( x ) , thus generalizing to arbitrary d previously known formulas for d = 1 (often referred to as “spectral parameter power series” or “SPPS”). The...
Saved in:
| Published in | Boletín de la Sociedad Matemática Mexicana Vol. 22; no. 1; pp. 141 - 163 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Cham
Springer International Publishing
01.04.2016
|
| Subjects | |
| Online Access | Get full text |
Cover
Loading…
| Summary: | We give explicit formulas for a pair of linearly independent solutions of
(
p
y
′
)
′
(
x
)
+
q
(
x
)
y
(
x
)
=
(
λ
1
r
1
(
x
)
+
⋯
+
λ
d
r
d
(
x
)
)
y
(
x
)
, thus generalizing to arbitrary
d
previously known formulas for
d
=
1
(often referred to as “spectral parameter power series” or “SPPS”). These formulas are power series in the spectral parameters
λ
1
,
⋯
,
λ
d
(real or complex), with coefficients which are functions on the interval of definition of the differential equation. The coefficients are obtained recursively using indefinite integrals involving the coefficients of lower degree. Examples are provided in which these formulas are used to solve numerically some boundary value problems for
d
=
2
, as well as an application to transmission and reflectance in optics. |
|---|---|
| ISSN: | 1405-213X 2296-4495 |
| DOI: | 10.1007/s40590-015-0078-2 |