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Legendre orthogonality

by Roy Vincent L. Canseco, MSEE     Jan 2014


The Legendre polynomials can also be generated using Gram-Schmidt orthonormalization in the open interval (-1,1) with the weighting function 1 [1].

The inner product of orthogonal vectors is 0. The inner product for polynomials can be defined as
  [2]

We verify the orthogonality of the first 6 Legendre polynomials by integrating using one of the polynomials as p(t) and another as q(t). The weighting function is taken to be 1 and we integrate from -1 to 1.



The following are the inner products of the Legendre polynomials with each other. They all evaluate to 0, which directly verifies that the first 6 Legendre polynomials are mutually orthogonal.


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[1] http://mathworld.wolfram.com/LegendrePolynomial.html
[2] Heath. Scientific Computing, an Introductory Survey
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