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We extend results of Favini, Nashed, and Zhao on singular differential equations using the g -Drazin inverse and the order of a quasinilpotent operator in the sense of Miekka and Nevanlinna. Two classes of singularly perturbed differential equations are studied using the continuity properties of the g -Drazin inverse obtained by Koliha and Rakočević.
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Abdeljabbar et al. (2016) studied this question.
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