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MATH60006/70006/97028 Applied Complex Analysis Coursework 2
发布时间:2022-03-07
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MATH60006/70006/97028 Applied Complex Analysis
Coursework 2
Consider the differential equation
(1 - x2 )yJ (x) - (2α + 1)xy/(x) + λy(x) = 0, -1 < x < 1, (1)
where α > - (α ≠ 0) and λ are real parameters.
(a). By direct substitution of the expression
n
y(x) =_ arxr ,
r =0
into the differential equation deduce that (1) has a polynomial solution of degree n (which we will call Cα)(x)) if λ = n(n + 2α).
[Note: throughout this worksheet you may drop the superscript notation (α) and
simply refer to the polynomials as Cn(x) for ease of writing should you wish to.] [4 marks]
(b). Write down the functions p(x) and q(x) from (1) and determine the associated
weight function w(x).
[3 marks]
(c). Write down the Rodriguez’ formula for Cα)(x) . Using this obtain expressions for C
α)(x), C
α)(x) and Cα)(x)
.
[4 marks]
Now consider the generating function for Cα)(x) given by
G(x, y) = (1 - 2xy + y2 )-α ,
which, when expanded in terms of y, gives
o
G(x, y) =_ Cα)(x)y
n=0
(d). Verify that this generating function produces Cα)(x) , C
α)(x) and Cα)(x)
as found in part (c) (up to normalisation).
[3 marks]
(e). Show that the polynomials {Cα)(x)} satisfy the three-term recurrence relation nCα)(x) =
2x(n + α - 1)C
(x) - (n + 2α - 2)C
(x).
[6 marks]
[Total: 20 marks]