93Axx General
- 93A05 Axiomatic system theory
- 93A10 General systems
- 93A13 Hierarchical systems
- 93A14 Decentralized systems
- 93A15 Large scale systems
- 93A30 Mathematical modeling (models of systems, model-matching, etc.) (1)
- 93A99 None of the above, but in this section