Mathematical Sciences Classification System
93Axx - General
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                            93A05Axiomatic system theory
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                            93A10General systems
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                            93A13Hierarchical systems
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                            93A14Decentralized systems
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                            93A15Large scale systems
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                            93A30Mathematical modeling (models of systems, model-matching, etc.)
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                            93A99None of the above, but in this section