Dong-Lun Wu

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Multiplicity results for an eigenvalue second-order Hamiltonian system are investigated. Using suitable critical points arguments, the existence of an exactly determined open interval of positive eigenvalues for which the system admits at least three distinct periodic solutions is established. Moreover , when the energy functional related to the Hamiltonian(More)
Maximum distance holey packing MDHP(2, k, v, g) was first introduced by Yin and used to construct an optimal (g + 1)-ary constant weight code (v, k, 2k−3) CWC. In this paper, an optimal holey packing OHP d (2, k,v, g) is introduced to construct an optimal (g + 1)-ary constant weight code (v, k, d) CWC. For k = 4, d = 4 and g = 2, it is proved that there(More)
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