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- W2950260080 abstract "We introduce a new method to construct uncountably chromatic graphs from non special trees and ladder systems. Answering a question of P. ErdH{o}s and A. Hajnal from 1985, we construct graphs of chromatic number $omega_1$ without uncountable $omega$-connected subgraphs. Second, we build triangle free graphs of chromatic number $omega_1$ without subgraphs isomorphic to $H_{omega,omega+2}$." @default.
- W2950260080 created "2019-06-27" @default.
- W2950260080 creator A5072335890 @default.
- W2950260080 date "2014-09-09" @default.
- W2950260080 modified "2023-09-27" @default.
- W2950260080 title "Trees, ladders and graphs" @default.
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