Erkenntnis 77 (2):237-272 (2012)

Authors
Gregor Betz
Karlsruhe Institute of Technology
Abstract
This paper gives an explication of our intuitive notion of strength of justification in a controversial debate. It defines a thesis' degree of justification within the bipolar argumentation framework of the theory of dialectical structures as the ratio of coherently adoptable positions according to which that thesis is true over all coherently adoptable positions. Broadening this definition, the notion of conditional degree of justification, i.e.\ degree of partial entailment, is introduced. Thus defined degrees of justification correspond to our pre-theoretic intuitions in the sense that supporting and defending a thesis t increases, whereas attacking it decreases, t's degree of justification. Moreover, it is shown that (conditional) degrees of justification are (conditional) probabilities. Eventually, the paper explains that it is rational to believe theses with a high degree of justification insofar as this strengthens the robustness of one's position.
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Reprint years 2011, 2012
DOI 10.1007/s10670-011-9314-y
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References found in this work BETA

Logical Foundations of Probability.Rudolf Carnap - 1950 - Chicago]University of Chicago Press.
Defeasible Reasoning.John L. Pollock - 1987 - Cognitive Science 11 (4):481-518.

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Citations of this work BETA

Truth in Evidence and Truth in Arguments Without Logical Omniscience.Gregor Betz - 2016 - British Journal for the Philosophy of Science 67 (4):1117-1137.

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