“Pfaff-Birkhoff principle”的概念、定义、翻译、参考文献-科学参考

单词	Pfaff-Birkhoff principle
释义	Pfaff-Birkhoff principle Encyclopedia 理学力学变分原理释 Pfaff-Birkhoff principle普法夫-伯克霍夫原理将G.D.伯克霍夫在1927年给出的一类积分变分原理推广到包含时间的情形从而得到的积分变分原理。
随便看	relational uncertainty relation between different phonological categories relation between generation relation by marriage relation extraction relation for the jumps relation greater than relation less than relation matrix relation of between relation of betweenness relation of chord relation of completeness relation of concatenation relation of disjointness relation of equality relation of equipollence relation of following relation of identity relation of inclusion relation of mining and development relation of order relation of subordination Relations relations among the convergence of random variables

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