A s impl e co mpac t formulation is prese nted for th e e ige nvalu e ' A of th e Mat hi e u diffe re ntial equat ion y" + ('A -2,, 2 cos 26)y = O. The relati ons obtained the re by are e mployed to ex amin e ce rtai n c haracte ri s ti c features of the so lution s y = ei"o L c"e 2i " o in both stable (v real) and un s tabl e (v co mplex ) regi o ns.
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Tamir et al. (1965) studied this question.