Using the F hypercenter of minimal subgroups, this paper gives a sufficient condition under which a soluble group belongs to a given formation F.

设F是任一子群闭的局部群系，利用极小子群的F超中心性，给出一类可解群属于F的一个充分条件，由此得到一些群的结。

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DAST is one of the most important fluorinating agents in this century. This paper has summarized the recent advances in the formation of C-F bond by DAST.

DAST试剂是本世纪开发的最重要的氟化试剂之一，本文综述了利用该试剂形成碳-氟键的新进展。

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A C-F cleavage reaction was found when using ortho-fluoro substituted benzonitrile, which resulted in the formation of new C-C bond.

发现该反应在以邻位氟取代的苯睛为底物的情况下，碳-氟键可以被打断并有效地形成碳-碳键。

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The chart of the November crude oil contract shows that prices are reaching the apex of its flag formation, lines f and g.

FORBES: Key Levels to Watch

Over the next three months, DIA formed a flag formation, lines e and f.

FORBES: Unlocking Chart Secrets with Volume

The completion of the short-term triangle formation (lines e and f) last week was accompanied by strong volume.

FORBES: 2 Ways to Buy More Gold for 2013