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Friendliness and Sympathy in Logic

  • David Makinson

Abstract

We define and examine a notion of logical friendliness, which is a broadening of the familiar notion of classical consequence. The concept is studied first in its simplest form, and then in a syntax-independent version, which we call sympathy. We also draw attention to the surprising number of familiar notions and operations with which it makes contact, providing a new light in which they may be seen.

Keywords

Classical Logic Classical Consequence Propositional Formula Conservative Extension Paraconsistent Logician 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Birkhäuser Verlag Basel/Switzerland 2007

Authors and Affiliations

  • David Makinson
    • 1
  1. 1.Dept. of Philosophy, Logic & Scientific MethodLondon School of EconomicsLondonUK

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