The Laplacian Eigenvalues and Invariants of Graphs

In this paper, we investigate some relations between the invariants (including vertex and edge connectivity and forwarding indices) of a graph and its Laplacian eigenvalues. In addition, we present a sufficient condition for the existence of Hamiltonicity in a graph involving its Laplacian eigenvalues.Comment: 10 pages,Filomat, 201

Clinical effects of using rigid gas permeable contact lens for refractoriness amblyopia

AIM:To explore the clinical effects of using rigid gas permeable contact lens(RGP)for refractoriness amblyopia patients. <p>METHODS: Ninety-eight cases(98 eyes)were voluntarily divided into RGP group and frame glasses group, and the two groups were received the regularity combined training to treat amblyopia for 6mo. We overviewed the corrected vision(on that day, 1, 3, 6mo)and the complication in RGP group. <p>RESULTS: The corrected vision in RGP group was obviously better than that in control group during the same time. The therapeutic efficacy in RGP group was better than that in frame glasses group, without serious complications at 6mo after treatment.<p>CONCLUSION: RGP groups could get better corrected visual acuity. It is safe and effective to improve corrected vision for refractoriness amblyopia patients