
doi: 10.2307/3608718
1. We deal with the equation where ψ(ωt) is continuous, periodic in t with period 2π/ω a, k 2 are real and positive, and A stable (bounded) solution was given by Erdélyi in 1934 employing a complicated transformation and integral equations. We shall obtain this solution by an elementary method, thereby reducing the analysis to one-third of its former length.
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