Strengthened fixed point property and products in ordered sets |
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Authors: | Josef Niederle |
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Institution: | (1) Katedra algebry a geometrie, Masarykova universita, Janáčkovo náměstí 2a, CZ-602 00 Brno, Czechoslovakia |
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Abstract: | Strengthened fixed point property for ordered sets is formulated. It is weaker than the strong fixed point property due to
Duffus and Sauer and stronger than the product property meaning that A × Y has the fixed point property whenever A has the former and Y has the latter. In particular, doubly chain complete ordered sets with no infinite antichain have the strengthened fixed
point property whenever they have the fixed point property, which yields a transparent proof of the well-known theorem saying
that doubly chain complete ordered sets with no infinite antichain have the product property whenever they have the fixed
point property. The new proof does not require the axiom of choice.
Presented at the Summer School on General Algebra and Ordered Sets, Malá Morávka, 4–10 September 2005. |
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Keywords: | doubly chain complete ordered set fixed point property product |
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