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Unpublished Paper
McColm’s Conjecture
(1994)
  • Yuri Gurevich
  • Neil Immerman, University of Massachusetts - Amherst
  • Saharon Shelah
Abstract

Gregory McColm conjectured that positive elementary inductions are bounded in a class K of finite structures if every (FO + LFP) formula is equivalent to a first-order formula in K. Here (FO + LFP) is the extension of first-order logic with the least fixed point operator. We disprove the conjecture. Our main results are two model-theoretic constructions, one deterministic and the other randomized, each of which refutes McColm’s conjecture.

Disciplines
Publication Date
November 15, 1994
Comments
This is the pre-published version harvested from arXiv.
Citation Information
Yuri Gurevich, Neil Immerman and Saharon Shelah. "McColm’s Conjecture" (1994)
Available at: http://works.bepress.com/neil_immerman/4/