A graph is weakly perfect if its clique number and chromatic number are equal. We show that the enhanced power graph of a finite group G is weakly perfect: its clique number and chromatic number are equal to the maximum order of an element of G. The proof requires a combinatorial lemma. We give some remarks about related graphs.
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Univ Napoli Federico II, Dipartimento Matemat & Applicaz, Complesso Univ Monte S Angelo,Via Cintia, Naples, ItalyUniv Napoli Federico II, Dipartimento Matemat & Applicaz, Complesso Univ Monte S Angelo,Via Cintia, Naples, Italy
De Falco, M.
de Giovanni, F.
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Univ Napoli Federico II, Dipartimento Matemat & Applicaz, Complesso Univ Monte S Angelo,Via Cintia, Naples, ItalyUniv Napoli Federico II, Dipartimento Matemat & Applicaz, Complesso Univ Monte S Angelo,Via Cintia, Naples, Italy
de Giovanni, F.
Musella, C.
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Univ Napoli Federico II, Dipartimento Matemat & Applicaz, Complesso Univ Monte S Angelo,Via Cintia, Naples, ItalyUniv Napoli Federico II, Dipartimento Matemat & Applicaz, Complesso Univ Monte S Angelo,Via Cintia, Naples, Italy
Musella, C.
Sysak, Y. P.
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Ukrainian Natl Acad Sci, Inst Math, Kiev, UkraineUniv Napoli Federico II, Dipartimento Matemat & Applicaz, Complesso Univ Monte S Angelo,Via Cintia, Naples, Italy
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Clemson Univ, Sch Math & Stat Sci, O-110 Martin Hall,Box 340975, Clemson, SC 29634 USAClemson Univ, Sch Math & Stat Sci, O-110 Martin Hall,Box 340975, Clemson, SC 29634 USA
Costanzo, David G.
Lewis, Mark L.
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Kent State Univ, Dept Math Sci, 1300 Lefton Esplanade, Kent, OH 44242 USAClemson Univ, Sch Math & Stat Sci, O-110 Martin Hall,Box 340975, Clemson, SC 29634 USA
Lewis, Mark L.
Schmidt, Stefano
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Princeton Univ, Dept Math, Fine Hall,Washington Rd, Princeton, NJ 08540 USAClemson Univ, Sch Math & Stat Sci, O-110 Martin Hall,Box 340975, Clemson, SC 29634 USA
Schmidt, Stefano
Tsegaye, Eyob
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Princeton Univ, Dept Math, Fine Hall,Washington Rd, Princeton, NJ 08540 USAClemson Univ, Sch Math & Stat Sci, O-110 Martin Hall,Box 340975, Clemson, SC 29634 USA
Tsegaye, Eyob
Udell, Gabe
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Cornell Univ, Dept Math, Malott Hall,212 Garden Ave, Ithaca, NY 14853 USAClemson Univ, Sch Math & Stat Sci, O-110 Martin Hall,Box 340975, Clemson, SC 29634 USA