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A note on minors of uncountable graphs. (English) Zbl 0843.05099

The author shows that for every uncountable cardinal \(\lambda\) there exist \(2^\lambda\) graphs of size \(\lambda\) which are pairwise not comparable with respect to the minor relation. The construction involves results on stationary subsets of \(\lambda\). The existence of infinitely many uncountable minor-incomparable graphs was shown along different lines by R. Thomas [A counter-example to “Wagner’s conjecture” for infinite graphs, Math. Proc. Camb. Philos. Soc. 103, No. 1, 55-57 (1988; Zbl 0647.05054)].
Reviewer: H.A.Jung (Berlin)

MSC:

05C99 Graph theory

Citations:

Zbl 0647.05054
Full Text: DOI

References:

[1] Thomas, Math. Proc. Cambridge Phil. Soc. 103 pp 55– (1988)
[2] Kunen, Set Theory 102 (1980)
[3] DOI: 10.1002/jgt.3190140502 · Zbl 0745.05028 · doi:10.1002/jgt.3190140502
[4] Solovay, Axiomatic Set Theory, Proc. Symp. Pure Math. 13 pp 365– (1974)
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