5 found
Eric M. Hammer [5]Eric Morgan Hammer [1]
  1.  73
    Euler’s Visual Logic.Eric M. Hammer & Sun-Joo Shin - 1998 - History and Philosophy of Logic 19 (1):1-29.
    The evolution of Euler diagrams is examined from Euler's original system through the modifications made by Venn and Peirce. It is shown that these modifications were motivated by an attempt to increase the expressivity of the diagrams, but that a side effect of these modifications was a loss of the visual clarity of Euler's original system. Euler's original system is reconstructed from a modern, logical point of view. Formal semantics and rules of inference are provided for this reconstruction of Euler's (...)
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  2.  53
    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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    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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    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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    Review: Sun-Joo Shin, The Logical Status of Diagrams. [REVIEW]Eric M. Hammer - 1996 - Journal of Symbolic Logic 61 (1):341-342.