93Axx General
- 93A05 Axiomatic system theory
- 93A10 General systems
- 93A13 Hierarchical systems
- 93A14 Decentralized systems
- 93A15 Large scale systems
- 93A20 Cascaded systems
- 93A25 Input-output systems
- 93A30 Mathematical modeling (models of systems, model-matching, etc.)
- 93A99 None of the above but in this section
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