“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	funicular polygon funiculus funiculus umbilicalis Funing Qu Funing Xian Funiu Shan funnel funnel chest funnel formation in extrusion funnel-gate system funnelid physochlaina root funneling funneling effect funnel model Funnel plot funnel prominence funnel-shaped corolla funnel-shaped nebula funnel viscosity funny curve f unsaturated path f-unsaturated path Fu of Changyang Fu of describing thing Fu of Eulogy on Qu Yuan

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