Original writings by Avi Sion on the theory and practice of inductive and deductive LOGIC  

The Logician   Ö Philosophy, Epistemology, Phenomenology, Aetiology, Psychology, Meditation Ö

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A FORTIORI LOGIC

© Avi Sion, 2013. All rights reserved.

 

PART  I  - FORMALITIES

The first part, Formalities, presents the authorís largely original theory of a fortiori argument, in all its forms and varieties. Its four (or eight) principal moods are analyzed in great detail and formally validated, and secondary moods are derived from them. A crescendo argument is distinguished from purely a fortiori argument, and similarly analyzed and validated. These argument forms are clearly distinguished from the pro rata and analogical forms of argument. Moreover, we examine the wide range of a fortiori argument; the possibilities of quantifying it; the formal interrelationships of its various moods; and their relationships to syllogistic and analogical reasoning. Although a fortiori argument is shown to be deductive, inductive forms of it are acknowledged and explained. Although a fortiori argument is essentially ontical in character, more specifically logical-epistemic and ethical-legal variants of it are acknowledged.

 

1.            The standard forms

2.            More formalities

3.            Still more formalities

4.            Apparently variant forms

5.            Comparisons and correlations

 

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