## 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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