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Abstract:
Let G = (V,E) be a graph with m edges. For reals p is an element of [0, 1] and q = 1 - p, let m(p)(G) be the minimum of qe(V-1) + pe(V-2) over partitions V = V (1) boolean OR V-2, where e(V-i) denotes the number of edges spanned by V-i. We show that if m(p)(G) = pqm - delta, then there exists a bipartition V-1, V-2 of G such that e(V-1) <= p(2) m - delta + p root m/2 + o(root m) and e(V-2) <= q(2) m - delta + q root m/2 + o(root m) for delta = o (m(2/3)). This is sharp for complete graphs up to the error term o(root m). For an integer k >= 2, let f(k)(G) denote the maximum number of edges in a k-partite subgraph of G. We prove that if f(k)(G) = (1 - 1/k) m + alpha, then G admits a k-partition such that each vertex class spans at most m/k(2) - ohm(m/k(7.5)) edges for alpha = ohm(m/k(6)). Both of the above improve the results of Bollob ' as and Scott.
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ACTA MATHEMATICA SINICA-ENGLISH SERIES
ISSN: 1439-8516
CN: 11-2039/O1
Year: 2017
Issue: 5
Volume: 33
Page: 668-680
0 . 5 2 7
JCR@2017
0 . 8 0 0
JCR@2023
ESI Discipline: MATHEMATICS;
ESI HC Threshold:71
JCR Journal Grade:3
CAS Journal Grade:4
Cited Count:
WoS CC Cited Count: 1
SCOPUS Cited Count: 1
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1
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