On structural descriptions of lower idea
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Yared Nigussie; Neil Robertson
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Article
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2005
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John Wiley and Sons
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English
β 149 KB
## Abstract A finite structural description for proper lower ideals of trees was found in [5] by Robertson, Seymour, and Thomas. They proved existence of a specific description satisfying three axioms. We present our result starting from this fundamental construction. In an attempt to make their de