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Authors
Affiliations
1 Department of Mathematics, Pennsylvania State University, University Park, (Penna) 16802, US
Source
The Journal of the Indian Mathematical Society, Vol 39, No 1-4 (1975), Pagination: 29-49
Abstract
It is shown that the classical set {cos nx, sin nx} is the only real trigonometric polynomial set that satisfies a linear differential equation of the form Σ̅ ak (x)y(k)n(x) = λn yn (x) where λn is a parameter and the i coefficients {ak(x)} are independent of n.