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- Birkhoff理论Birkhoff theory
- 理论theory
- 理论的academic
- 理论上theoretically
- 理论知识speculative knowledge
- Birkhoff正交Biekhoff arthogonalizes
- Birkhoff系统Birkhoffian system
- 理论基础theoretical principle
- Birkhoff正交性Birkhoff orthogonality
- 理论上的theoretic
- 二元Birkhoff插值bivariate Birkhoff interpolation
- 自由Birkhoff系统freedom Birkhoffian system
- 军事理论Military Theory
- 理论体系system info
- 高维自治Birkhoff系统higher order autonomous Birkhoff system
- 理论依据theoretical foundation
- 广义Birkhoff系统动力学generalized Birkhoff system dynamics
- 理论力学theoretical mechanics
- Poincar-éBirkhoff扭转定理Poincaré-Birkhoff theorem
- 理论研究theoretical research
