New Essays in Free Logic

1. Front Matter

   Pages i-vii

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2. Freelogic: a Fifty-Year Past and an Open Future

   1. Free Logic: A Fifty-Year Past and an Open Future

      • Edgar Morscher, Peter Simons

      Pages 1-34

3. Names and Definite Descriptions

   1. Front Matter

      Pages 35-35

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   2. Free Logic and Definite Descriptions

      • Karel Lambert

      Pages 37-47

   3. Calculi of Names: Free and Modal

      • Peter Simons

      Pages 49-65

4. Modalities

   1. Front Matter

      Pages 67-67

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   2. Free Logic and Quantification in Syntactic Modal Contexts

      • Paul Schweizer

      Pages 69-85

   3. Substitution, Quantifiers and Identity in Modal Logic

      • Silvio Ghilardi

      Pages 87-115

   4. Free Epistemic Logic

      • Wolfgang Lenzen

      Pages 117-124

5. Semantics and Programming

   1. Front Matter

      Pages 125-125

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   2. Supervaluational Free Logic and the Logic of Information Growth

      • Juan Barba Escribá

      Pages 127-146

   3. “No Input, No Output” Logic

      • Scott Lehmann

      Pages 147-155

   4. Free Logic in Program Specification and Verification

      • Raymond D. Gumb

      Pages 157-193

6. History

   1. Front Matter

      Pages 195-195

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   2. Existence and Reference in Medieval Logic

      • Gyula Klima

      Pages 197-226

   3. Can Meinongian Logic be Free?

      • Jacek Paśniczek

      Pages 227-236

7. Comments

   1. Front Matter

      Pages 237-237

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   2. Comments

      • Karel Lambert

      Pages 239-252

8. Back Matter

   Pages 253-255

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Free logic - i.e., logic free of existential presuppositions in general and with respect to singular terms in particular- began to come into its own as a field of research in the 1950s. As is the case with so many developments in Western philosophy, its roots can be traced back to ancient Greek philo­ sophy. It is only during the last fifty years, however, that it has become well established as a branch of modern logic. The name of Karel Lambert is most closely connected with this development: he gave it its name and its profile as a well defined field of research. After a development of fifty years, it is time to look back and take stock while at the same time scanning for new perspectives. This is the purpose of the papers collected in this volume. The first paper is written by Karel Lambert himself who also comments on all the papers of the other authors. In an introductory essay we give a survey of the present status of and new directions in free logic.

• formal logic
• logic
• modal logic
• semantic
• semantics

• Department of Philosophy, University of Salzburg, Austria

  Edgar Morscher, Alexander Hieke

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