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# Article

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Keywords:
oscillation problem; periodic differential equation; periodic solution; $\omega$-periodic solution; trigonometric polynomial; trigonometric approximation; Gram’s determinant
Summary:
The present paper does not introduce a new approximation but it modifies a certain known method. This method for obtaining a periodic approximation of a periodic solution of a linear nonhomogeneous differential equation with periodic coefficients and periodic right-hand side is used in technical practice. However, the conditions ensuring the existence of a periodic solution may be violated and therefore the purpose of this paper is to modify the method in order that these conditions remain valid.
References:
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