Erratum for some errata to ATP problems

Francis Jeffry Pelletier, Geoff Sutcliffe

Research output: Contribution to journalArticlepeer-review


An innovative list of 75 logic problems for testing ATP systems was introduced in 1986. The problems are presented in a natural first-order form (FOF), and most of them are also given in an equivalent negated conclusion clause normal form (CNF). However, shortly the introduction of the logic problems, some errata are presented. In particular, Problem 62 was corrected. But recently, it has been discovered that both the CNF and FOF version of the Problem 62 of the errata presented are incorrect. This paper presents the correct version of Problem 62. Problem 62 is on of four variations on the same problem, the others being Problems 17, 33 and 38. The relationships among these problems are discussed. Their CNF versions and an explanation of the relevant of Problem 62 are also given.

Original languageEnglish (US)
Pages (from-to)135
Number of pages1
JournalJournal of Automated Reasoning
Issue number1
StatePublished - Feb 1997
Externally publishedYes

ASJC Scopus subject areas

  • Software
  • Computational Theory and Mathematics
  • Artificial Intelligence


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