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Eric M. Hammer [4]Eric Morgan Hammer [1]
  1.  52
    Semantics for Existential Graphs.Eric M. Hammer - 1998 - Journal of Philosophical Logic 27 (5):489-503.
    This paper examines Charles Peirce's graphical notation for first-order logic with identity. The notation forms a part of his system of "existential graphs," which Peirce considered to be his best work in logic. In this paper a Tarskian semantics is provided for the graphical system.
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  2.  10
    Review: Sun-Joo Shin, The Logical Status of Diagrams. [REVIEW]Eric M. Hammer - 1996 - Journal of Symbolic Logic 61 (1):341-342.
  3.  10
    Shin Sun-Joo. The Logical Status of Diagrams. Cambridge University Press, Cambridge, New York, and Oakleigh, Victoria, 1995 , Xi + 197 Pp. [REVIEW]Eric M. Hammer - 1996 - Journal of Symbolic Logic 61 (1):341-342.
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  4.  55
    The Truths of Logic.Eric M. Hammer - 1996 - Synthese 109 (1):27 - 45.
    Several accounts of logical truth are compared and shown to define distinct concepts. Nevertheless, conditions are given under which they happen to declare exactly the same sentences logically true. These conditions involve the variety of objects in the domain, the richness of the language, and the logical resources available. It is argued that the class of sentences declared logically true by each of the accounts depends on particularities of the actual world.
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