Досліджується позитивність та асимптотична стійкість нелінійних систем, часові залежності яких є дискретними або неперервними. Встановлено достатні умови позитивності та асимптотичної стійкості нелінійних систем. Запропоновані тести на стійкість базуються на розширені методу О.Ляпунова для позитивних нелінійних систем. Ефективність цих тестів демонструється на прикладах.
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