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Item Open Access A natural deduction relevance logic(Colorado State University. Libraries, 1977) Johnson, Fred (Frederick A.), author; Institute of Philosophy and Sociology, Polish Academy of Sceinces, publisherItem Open Access Extended Gergonne syllogisms(Colorado State University. Libraries, 1997) Johnson, Fred (Frederick A.), author; Kluwer Academic Publishers, publisherSyllogisms with or without negative terms are studied by using Gergonne's ideas. Soundness, completeness, and decidability results are given.