# Classes of hypergraphs with sum number one

• Volume: 20, Issue: 1, page 93-103
• ISSN: 2083-5892

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## Abstract

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A hypergraph ℋ is a sum hypergraph iff there are a finite S ⊆ ℕ⁺ and d̲,d̅ ∈ ℕ⁺ with 1 < d̲ < d̅ such that ℋ is isomorphic to the hypergraph ${ℋ}_{d̲,d̅}\left(S\right)=\left(V,\right)$ where V = S and $=e\subseteq S:d̲<|e|. For an arbitrary hypergraph ℋ the sum number(ℋ ) is defined to be the minimum number of isolatedvertices $w₁,...,{w}_{\sigma }\notin V$ such that $ℋ\cup w₁,...,{w}_{\sigma }$ is a sum hypergraph. For graphs it is known that cycles Cₙ and wheels Wₙ have sum numbersgreater than one. Generalizing these graphs we prove for the hypergraphs ₙ and ₙ that under a certain condition for the edgecardinalities (ₙ)= (ₙ)=1

## How to cite

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Hanns-Martin Teichert. "Classes of hypergraphs with sum number one." Discussiones Mathematicae Graph Theory 20.1 (2000): 93-103. <http://eudml.org/doc/270220>.

@article{Hanns2000,
abstract = {A hypergraph ℋ is a sum hypergraph iff there are a finite S ⊆ ℕ⁺ and d̲,d̅ ∈ ℕ⁺ with 1 < d̲ < d̅ such that ℋ is isomorphic to the hypergraph $ℋ_\{d̲,d̅\}(S) = (V,)$ where V = S and $= \{e ⊆ S: d̲ < |e| < d̅ ∧ ∑_\{v∈ e\} v∈ S\}$. For an arbitrary hypergraph ℋ the sum number(ℋ ) is defined to be the minimum number of isolatedvertices $w₁,..., w_σ∉ V$ such that $ℋ ∪ \{w₁,..., w_σ\}$ is a sum hypergraph. For graphs it is known that cycles Cₙ and wheels Wₙ have sum numbersgreater than one. Generalizing these graphs we prove for the hypergraphs ₙ and ₙ that under a certain condition for the edgecardinalities (ₙ)= (ₙ)=1},
author = {Hanns-Martin Teichert},
journal = {Discussiones Mathematicae Graph Theory},
keywords = {hypergraphs; sum number; vertex labelling; sum graph; sum hypergraph},
language = {eng},
number = {1},
pages = {93-103},
title = {Classes of hypergraphs with sum number one},
url = {http://eudml.org/doc/270220},
volume = {20},
year = {2000},
}

TY - JOUR
AU - Hanns-Martin Teichert
TI - Classes of hypergraphs with sum number one
JO - Discussiones Mathematicae Graph Theory
PY - 2000
VL - 20
IS - 1
SP - 93
EP - 103
AB - A hypergraph ℋ is a sum hypergraph iff there are a finite S ⊆ ℕ⁺ and d̲,d̅ ∈ ℕ⁺ with 1 < d̲ < d̅ such that ℋ is isomorphic to the hypergraph $ℋ_{d̲,d̅}(S) = (V,)$ where V = S and $= {e ⊆ S: d̲ < |e| < d̅ ∧ ∑_{v∈ e} v∈ S}$. For an arbitrary hypergraph ℋ the sum number(ℋ ) is defined to be the minimum number of isolatedvertices $w₁,..., w_σ∉ V$ such that $ℋ ∪ {w₁,..., w_σ}$ is a sum hypergraph. For graphs it is known that cycles Cₙ and wheels Wₙ have sum numbersgreater than one. Generalizing these graphs we prove for the hypergraphs ₙ and ₙ that under a certain condition for the edgecardinalities (ₙ)= (ₙ)=1
LA - eng
KW - hypergraphs; sum number; vertex labelling; sum graph; sum hypergraph
UR - http://eudml.org/doc/270220
ER -

## References

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1. [1] C. Berge, Hypergraphs (North Holland, Amsterdam-New York-Oxford-Tokyo, 1989).
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7. [7] N. Hartsfield and W.F. Smyth, A family of sparse graphs with large sum number, Discrete Math. 141 (1995) 163-171, doi: 10.1016/0012-365X(93)E0196-B. Zbl0827.05048
8. [8] M. Miller, Slamin, J. Ryan, W.F. Smyth, Labelling Wheels for Minimum Sum Number, J. Comb. Math. and Comb. Comput. 28 (1998) 289-297. Zbl0918.05091
9. [9] M. Sonntag and H.-M. Teichert, Sum numbers of hypertrees, Discrete Math. 214 (2000) 285-290, doi: 10.1016/S0012-365X(99)00307-6. Zbl0943.05071
10. [10] M. Sonntag and H.-M. Teichert, On the sum number and integral sum number of hypertrees and complete hypergraphs, Proc. 3rd Krakow Conf. on Graph Theory (1997), to appear.
11. [11] H.-M. Teichert, The sum number of d-partite complete hypergraphs, Discuss. Math. Graph Theory 19 (1999) 79-91, doi: 10.7151/dmgt.1087. Zbl0933.05104

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