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Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)

 
 

 

Inequalities in dimension theory for posets


Author: William T. Trotter
Journal: Proc. Amer. Math. Soc. 47 (1975), 311-316
MSC: Primary 06A10
DOI: https://doi.org/10.1090/S0002-9939-1975-0369192-2
MathSciNet review: 0369192
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Abstract: The dimension of a poset $ (X,P)$, denoted $ \dim (X,P)$, is the minimum number of linear extensions of $ P$ whose intersection is $ P$. It follows from Dilworth's decomposition theorem that $ \dim (X,P) \leq \operatorname{width} (X,P)$. Hiraguchi showed that $ \dim (X,P) \leq \vert X\vert/2$. In this paper, $ A$ denotes an antichain of $ (X,P)$ and $ E$ the set of maximal elements. We then prove that $ \dim (X,P) \leq \vert X - A\vert;\dim (X,P) \leq 1 + \operatorname{width} (X - E);$ and $ \dim (X,P) \leq 1 + 2\operatorname{width} (X - A)$. We also construct examples to show that these inequalities are sharp.


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DOI: https://doi.org/10.1090/S0002-9939-1975-0369192-2
Keywords: Poset, dimension, irreducible
Article copyright: © Copyright 1975 American Mathematical Society

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