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Split Euler Tours In 4-Regular Planar Graphs

PJ CouchB.D. DanielR. GuidryW. Paul Wright — 2016

Discussiones Mathematicae Graph Theory

The construction of a homing tour is known to be NP-complete. On the other hand, the Euler formula puts su cient restrictions on plane graphs that one should be able to assert the existence of such tours in some cases; in particular we focus on split Euler tours (SETs) in 3-connected, 4-regular, planar graphs (tfps). An Euler tour S in a graph G is a SET if there is a vertex v (called a half vertex of S) such that the longest portion of the tour between successive visits to v is exactly half the...

Nonoscillation theorems for forced second order non linear differential equations

John R. GraefPaul W. Spikes — 1975

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

Gli Autori provano alcuni nuovi criteri sufficienti, indipendenti da altri criteri da loro ottenuti in precedenza, perché gli integrali dell'equazione ( a ( t ) x ) + q ( t ) f ( x ) g ( x ) = r ( t ) siano tutti non oscillatori.

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