F -continuous graphs

Gary Chartrand; Elzbieta B. Jarrett; Farrokh Saba; Ebrahim Salehi; Ping Zhang

Czechoslovak Mathematical Journal (2001)

  • Volume: 51, Issue: 2, page 351-361
  • ISSN: 0011-4642

Abstract

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For a nontrivial connected graph F , the F -degree of a vertex v in a graph G is the number of copies of F in G containing v . A graph G is F -continuous (or F -degree continuous) if the F -degrees of every two adjacent vertices of G differ by at most 1. All P 3 -continuous graphs are determined. It is observed that if G is a nontrivial connected graph that is F -continuous for all nontrivial connected graphs F , then either G is regular or G is a path. In the case of a 2-connected graph F , however, there always exists a regular graph that is not F -continuous. It is also shown that for every graph H and every 2-connected graph F , there exists an F -continuous graph G containing H as an induced subgraph.

How to cite

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Chartrand, Gary, et al. "$F$-continuous graphs." Czechoslovak Mathematical Journal 51.2 (2001): 351-361. <http://eudml.org/doc/30639>.

@article{Chartrand2001,
abstract = {For a nontrivial connected graph $F$, the $F$-degree of a vertex $v$ in a graph $G$ is the number of copies of $F$ in $G$ containing $v$. A graph $G$ is $F$-continuous (or $F$-degree continuous) if the $F$-degrees of every two adjacent vertices of $G$ differ by at most 1. All $P_3$-continuous graphs are determined. It is observed that if $G$ is a nontrivial connected graph that is $F$-continuous for all nontrivial connected graphs $F$, then either $G$ is regular or $G$ is a path. In the case of a 2-connected graph $F$, however, there always exists a regular graph that is not $F$-continuous. It is also shown that for every graph $H$ and every 2-connected graph $F$, there exists an $F$-continuous graph $G$ containing $H$ as an induced subgraph.},
author = {Chartrand, Gary, Jarrett, Elzbieta B., Saba, Farrokh, Salehi, Ebrahim, Zhang, Ping},
journal = {Czechoslovak Mathematical Journal},
keywords = {$F$-degree; $F$-degree continuous; -degree; -degree continuous},
language = {eng},
number = {2},
pages = {351-361},
publisher = {Institute of Mathematics, Academy of Sciences of the Czech Republic},
title = {$F$-continuous graphs},
url = {http://eudml.org/doc/30639},
volume = {51},
year = {2001},
}

TY - JOUR
AU - Chartrand, Gary
AU - Jarrett, Elzbieta B.
AU - Saba, Farrokh
AU - Salehi, Ebrahim
AU - Zhang, Ping
TI - $F$-continuous graphs
JO - Czechoslovak Mathematical Journal
PY - 2001
PB - Institute of Mathematics, Academy of Sciences of the Czech Republic
VL - 51
IS - 2
SP - 351
EP - 361
AB - For a nontrivial connected graph $F$, the $F$-degree of a vertex $v$ in a graph $G$ is the number of copies of $F$ in $G$ containing $v$. A graph $G$ is $F$-continuous (or $F$-degree continuous) if the $F$-degrees of every two adjacent vertices of $G$ differ by at most 1. All $P_3$-continuous graphs are determined. It is observed that if $G$ is a nontrivial connected graph that is $F$-continuous for all nontrivial connected graphs $F$, then either $G$ is regular or $G$ is a path. In the case of a 2-connected graph $F$, however, there always exists a regular graph that is not $F$-continuous. It is also shown that for every graph $H$ and every 2-connected graph $F$, there exists an $F$-continuous graph $G$ containing $H$ as an induced subgraph.
LA - eng
KW - $F$-degree; $F$-degree continuous; -degree; -degree continuous
UR - http://eudml.org/doc/30639
ER -

References

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  1. An introduction to analytic graph theory, Utilitas Math (to appear). (to appear) MR1832600
  2. F -degrees in graphs, Ars Combin. 24 (1987), 133–148. (1987) MR0917968
  3. Graphs & Digraphs (third edition), Chapman Hall, New York, 1996. (1996) MR1408678
  4. Reguläre Graphen gegebener Taillenweite mit minimaler Knotenzahl, Wiss Z. Univ. Halle, Math-Nat. 12 (1963), 251–258. (1963) MR0165515
  5. Degree-continuous graphs, Czechoslovak Math. J (to appear). (to appear) MR1814641
  6. 10.1007/BF01456961, Math. Ann. 77 (1916), 453–465. (1916) MR1511872DOI10.1007/BF01456961

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