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A well known comparison theorem on ordinary differential inequalities with quasimonotone right-hand side f(t, x) was carried over by Volkmann (1972) to (pre)ordered topological vector spaces. We prove ...
https://doi.org/10.4169/amer.math.monthly.121.03.260 https://www.jstor.org/stable/10.4169/amer.math.monthly.121.03.260 Abstract This note gives a “Zorn’s Lemma ...
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