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How many minimal upper bounds of minimal upper bounds

Wieviele minimale obere Schranken sind iterativ zu bilden?

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Abstract

We construct a family such that the maximal elementX n ∈ ℱ n can be obtained inductively by computing minimal upper bounds over already generated setsG, involving not less than exponentially many (with respect to |X n |) such intermediate setsG, starting with minimal ones in ℱ n .

Zusammenfassung

Es wird ein Beispiel einer Folge von Mengen konstruiert, sodaß das maximale ElementX n ∈ ℱ n der Teilmengen-Halbordnung frühestens nach exponentiell vielen (bezüglich |X n |) Zwischenschritten erreicht werden kann, wenn in jedem Schritt eine minimale obere Schranke über Mengen von solcherart bereits erhaltenen MengenG erzeugt wird.

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References

  1. Eiter, Th., Gottlob, G., Gurevich, Y.: Curb your theory! — A circumscriptive approach for inclusive interpretation of disjunctive information. Proceedings IJCAI-93, pp. 634–639, 1993.

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Bodenstorfer, B. How many minimal upper bounds of minimal upper bounds. Computing 56, 173–178 (1996). https://doi.org/10.1007/BF02309344

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  • DOI: https://doi.org/10.1007/BF02309344

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