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Fundamental central dispersions in a double system \(<<{\mathfrak G}>>\). (English) Zbl 0243.34116

MSC:

34A30 Linear ordinary differential equations and systems
34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations
34G99 Differential equations in abstract spaces
20F05 Generators, relations, and presentations of groups
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