It is well-known that every holomorphic vector bundle is filtrable on a projective algebraicmanifold, and any complex vector bundle E of rank 2 on a projective
Recently, Brownian ratchets have attracted considerable attention due to their abitlity to realize a unidirectional transport only throught the use of a proper
<正> Let SL(2,R)be the group of all real matrices of order2 with determinant 1.In this paper,weuse G to denote both SL(2.R) and the lie group SU(1,1)={(α/ββ/