Geodesic
Best approximation and the numerical solution of partial differential equations with the tau method
Portugaliae mathematica, Tome 40 (1981) no. 1, pp. 97-119.

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Keywords: Tau method, rate of convergence, best approximations, Numerical examples 
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     title = {Best approximation and the numerical solution of partial differential equations with the tau method},
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Namasivayam, S.; Ortiz, Eduardo L. Best approximation and the numerical solution of partial differential equations with the tau method. Portugaliae mathematica, Tome 40 (1981) no. 1, pp. 97-119. http://geodesic.mathdoc.fr/item/PORMA_1981__40_1_115442/