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【摘 要】
：
The purpose of this paper is to study the symmetry of first order Lagrangians and the corresponding conserved quantity. The relation between the Lagrangians and
【机 构】
：
SchoolofAerospaceEngineering,SchoolofMathematics
【出 处】
：
北京理工大学学报：英文版
【发表日期】
：
2015年1期
【基金项目】
：
Supported by the National Natural Science Foundation of Chi- na（10932002, 10972031, 11272050）
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