**Keywords:**
(recursive) three term recurrence relations,
multivariate Jacobi polynomials,
Legendre polynomials on a triangle,
barycentric coordinates,
symmetry group,

**Math Review Classification:**
Primary 33C50, 33F05, 42C05;
Secondary 05C90, 52B15

**Length:** 19 pages

**Last Updated:** 27 August 2009

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