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Legendre polynomials (Definition)

The Legendre polynomials generate the power series that solves Legendre’s differential equation:

(     2)  ′′         ′
 1 − x   P (x) − 2xP  (x) + n (n + 1)P (x ) = 0.

This Ordinary Differential Equation with variable coefficients is named in honor of Adrien-Marie Legendre (1752-1833). While quite literally following in the footsteps of Laplace, he developed the Legendre polynomials in a paper on celestial mechanics. In a strange tangled web of fate, the Legendre polynomials are heavily used in electrostatics to solve Laplace’s equation in spherical coordinates

  2
∇  Φsph = 0

The series can be easily generated using the Rodrigues’ formula

           1  dn    2    n
Pn (x) = -n-----n(x  − 1) .
         2 n! dx

The first six polynomials are:

P0(x) = 1
P1(x) = x
P2(x) = 1
2   2
(3x  −  1)
P3(x) = 12(5x3 −  3x)
P4(x) = 1
8(35x4 −  30x2 + 3)
P5(x) = 1
8(63x5 −  70x3 + 15x)

Not yet done....

0.1 References

[1] Lebedev, N. ”Special functions & Their Applications.” Dover Publications, Inc., New York, 1972.

[2] Jackson, J. ”Classical Electrodynamics.” John Wiley & Sons, Inc., New York, 1962.

http://www-groups.dcs.st-and.ac.uk/˜history/Biographies/Legendre.html http://astrowww.phys.uvic.ca/˜tatum/celmechs.html http://www.du.edu/˜jcalvert/math/legendre.htm http://en.wikipedia.org/wiki/Legendre_polynomials


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Cross-references: functions, formula, mechanics, Ordinary Differential Equation, differential equation, power series

This is version 4 of Legendre polynomials, born on 2006-05-22, modified 2006-06-12.
Object id is 177, canonical name is LegendrePolynomials.
Accessed 2650 times total.

Classification:
Physics Classification02.30.Mv (Approximations and expansions)
 02.30.Hq (Ordinary differential equations)
 02.30.Gp (Special functions)
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