This work was supported partially by the Hong Kong Qiu-Shi Foundation, the Out standing Youth Foundation of China and the Education Foundation of Tsinghua University, as well as the Grants in-Aid for
Homoclinic bifurcations in four-dimensional vector fields are investigated by setting up a local coordinate near a homoclinic orbit. This homoclinic orbit is pr
In this paper, a type of combinatorial design (called difference packing array)is proposed and used to give a construction of systematic authentication codes. T
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In this paper the authors give the weighted weak LlogL type estimates for a class of the higher order commutator generated by the Marcinkiewicz integral and a B