19 found
Order:
Disambiguations
Fred Johnson [18]Frederick A. Johnson [1]
See also
Frederick Johnson
Colorado State University
  1. Models for Modal Syllogisms.Fred Johnson - 1989 - Notre Dame Journal of Formal Logic 30 (2):271-284.
    A semantics is presented for Storrs McCall's separate axiomatizations of Aristotle's accepted and rejected polysyllogisms. The polysyllogisms under discussion are made up of either assertoric or apodeictic propositions. The semantics is given by associating a property with a pair of sets: one set consists of things having the property essentially and the other of things having it accidentally. A completeness proof and a semantic decision procedure are given.
    Download  
     
    Export citation  
     
    Bookmark   16 citations  
  2. Deductively-Inductively.Fred Johnson - 1980 - Informal Logic 3 (1):4-5.
    Download  
     
    Export citation  
     
    Bookmark   9 citations  
  3. Three-Membered Domains for Aristotle's Syllogistic.Fred Johnson - 1991 - Studia Logica 50 (2):181 - 187.
    The paper shows that for any invalid polysyllogism there is a procedure for constructing a model with a domain with exactly three members and an interpretation that assigns non-empty, non-universal subsets of the domain to terms such that the model invalidates the polysyllogism.
    Download  
     
    Export citation  
     
    Bookmark   7 citations  
  4. A Three-Valued Interpretation for a Relevance Logic.Fred Johnson - 1976 - The Relevance Logic Newsletter 1 (3):123-128.
    Download  
     
    Export citation  
     
    Bookmark   5 citations  
  5. Aristotle's Modal Syllogisms.Fred Johnson - 2004 - In Dov M. Gabbay, John Woods & Akihiro Kanamori (eds.), Handbook of the History of Logic. Elsevier. pp. 1--247.
    McCall's system for contingent syllogisms is modified. A semantics for the resulting system is provided.
    Download  
     
    Export citation  
     
    Bookmark   3 citations  
  6. Analogical Arguings and Explainings.Fred Johnson - 1989 - Informal Logic 11 (3).
    Download  
     
    Export citation  
     
    Bookmark   3 citations  
  7. Modal Ecthesis.Fred Johnson - 1993 - History and Philosophy of Logic 14 (2):171-182.
    Fred's semantics for McCall's syntactic presentation of Aristotle's assertoric and apodeictic syllogistic is altered to free it from Thom's objections that it is unAristotelian. The altered semantics rejects Baroco-XLL and Bocardo-LXL, which Thom says Aristotle should have accepted. Aristotle's proofs that use ecthesis are formalized by using singular sentences. With one exception the (acceptance) axioms for McCall's system L-X-M are derivable. Formal proofs are shown to be sound.
    Download  
     
    Export citation  
     
    Bookmark   3 citations  
  8. Apodeictic Syllogisms: Deductions and Decision Procedures.Fred Johnson - 1995 - History and Philosophy of Logic 16 (1):1-18.
    One semantic and two syntactic decision procedures are given for determining the validity of Aristotelian assertoric and apodeictic syllogisms. Results are obtained by using the Aristotelian deductions that necessarily have an even number of premises.
    Download  
     
    Export citation  
     
    Bookmark   2 citations  
  9. Syllogisms with Fractional Quantifiers.Fred Johnson - 1994 - Journal of Philosophical Logic 23 (4):401 - 422.
    Aristotle's syllogistic is extended to include denumerably many quantifiers such as 'more than 2/3' and 'exactly 2/3.' Syntactic and semantic decision procedures determine the validity, or invalidity, of syllogisms with any finite number of premises. One of the syntactic procedures uses a natural deduction account of deducibility, which is sound and complete. The semantics for the system is non-classical since sentences may be assigned a value other than true or false. Results about symmetric systems are given. And reasons are given (...)
    Download  
     
    Export citation  
     
    Bookmark   2 citations  
  10. A Natural Deduction Relevance Logic.Fred Johnson - 1977 - The Bulletin of the Section of Logic 6 (4):164-168.
    Download  
     
    Export citation  
     
    Bookmark   1 citation  
  11.  97
    Arguings and Arguments.Fred Johnson - 1984 - Informal Logic 6 (2):26-27.
    Download  
     
    Export citation  
     
    Bookmark   1 citation  
  12. Rejection and Truth-Value Gaps.Fred Johnson - 1999 - Notre Dame Journal of Formal Logic 40 (4):574-577.
    A theorem due to Shoesmith and Smiley that axiomatizes two-valued multiple-conclusion logics is extended to partial logics.
    Download  
     
    Export citation  
     
    Bookmark   1 citation  
  13. Parry Syllogisms.Fred Johnson - 1999 - Notre Dame Journal of Formal Logic 40 (3):414-419.
    Parry discusses an extension of Aristotle's syllogistic that uses four nontraditional quantifiers. We show that his conjectured decision procedure for validity for the extended syllogistic is correct even if syllogisms have more than two premises. And we axiomatize this extension of the syllogistic.
    Download  
     
    Export citation  
     
    Bookmark   1 citation  
  14.  87
    Counting Functions.Fred Johnson - 1992 - Notre Dame Journal of Formal Logic 33 (4):567-568.
    Counting functions are shown to be complete by using a simpler argument than that used by Pelletier and Martin.
    Download  
     
    Export citation  
     
    Bookmark  
  15. Copi's Method of Deduction.Frederick A. Johnson - 1979 - Notre Dame Journal of Formal Logic 20 (2):295-300.
    Copi's method of deduction is formalized and shown to be complete.
    Download  
     
    Export citation  
     
    Bookmark  
  16. Categorical Consequence for Paraconsistent Logic.Fred Johnson & Peter Woodruff - 2002 - In Walter Carnielli (ed.), Paraconsistency:the logical way to the inconsistent. pp. 141-150.
    Consequence rleations over sets of "judgments" are defined by using "overdetermined" as well as "underdetermined" valuations. Some of these relations are shown to be categorical. And generalized soundness and completeness results are given for both multiple and single conclusion consequence relations.
    Download  
     
    Export citation  
     
    Bookmark  
  17. Extended Gergonne Syllogisms.Fred Johnson - 1997 - Journal of Philosophical Logic 26 (5):553-567.
    Syllogisms with or without negative terms are studied by using Gergonne's ideas. Soundness, completeness, and decidability results are given.
    Download  
     
    Export citation  
     
    Bookmark  
  18.  40
    Suppositional Reasoning.Fred Johnson - 1991 - In Frans H. Van Eemeren (ed.), Proceedings of the Second International Conference on Argumentation 1990. pp. 281-287.
    Download  
     
    Export citation  
     
    Bookmark  
  19. Trees for a 3-Valued Logic.Fred Johnson - 1984 - Analysis 44 (1):43-6.
    Fred shows how problems with Slater's restriction of the classical propositional logic can be solved.
    Download  
     
    Export citation  
     
    Bookmark