### 93Bxx Controllability, observability, and system structure

- 93B03 Attainable sets
- 93B05 Controllability
- 93B06 Relations between controllability and optimal solutions
- 93B07 Observability
- 93B10 Canonical structure
- 93B11 System structure simplification
- 93B12 Variable structure systems
- 93B15 Realizability of systems from input-output data
- 93B17 Transformation
- 93B18 Linearizability
- 93B20 Minimal systems representations
- 93B25 Algebraic methods
- 93B27 Geometric methods (including algebro-geometric)
- 93B28 Operator-theoretic methods, See also {47A57, 47N70}
- 93B29 Differential-geometric methods
- 93B30 System identification
- 93B35 Sensitivity (robustness)
- 93B36 ${H}^ \infty$-control
- 93B40 Computational methods
- 93B50 Synthesis problems
- 93B51 Design techniques (robust design, computer-aided design, etc.)
- 93B52 Feedback control
- 93B55 Pole and zero placement problems
- 93B60 Eigenvalue problems
- 93B99 None of the above but in this section

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