It is known that every class-regular symmetric μ,m -net is tactical. Also it is known that all μ,m nets with m 2 or μ 1 are tactical. In the work of Al-Kenani and Mavron 2003 , it is proved that every symmetric net with m 3 is tactical if and only if it is class regular. In this paper, we construct 2, 4 -net and show that it is class regular and therefore tactical. New necessary and sufficient ...

The well-known problem of classical mechanics considered by Bertrand (1857) and Darboux (1901) is reviewed in the context of Cartan’s geometry. UDK: 514.85; MSC: 37J35, 53C05

In one of her earliest poems, "Sonnet", sense-perception is seen as an incessant process, the "laborious focus" of eyes and brain which accumulates material for later meditation. "The Maker" has particular relevance to the poet's art. This lyric deals with the poet's unique power to synthesise sense-data into song. In "GumTrees Stripping", on the other hand, sense-perception is but one part of ...