On Showing Invalidity

Canadian Journal of Philosophy 14 (1):97 - 101 (1984)
  Copy   BIBTEX


In studying logic, one learns how to establish that a conclusion follows from a set of premises. Those arguments that exhibit one of the valid forms of the deductive system under study are valid. There may be questions about what forms are exhibited by various arguments - Is this English conditional really truth-functional? Is this disjunction really inclusive? Are the English predicates used with uniform meaning? - but none of these problems undermine the claim that if an argument exhibits a valid form of a system for deductive logic, then that argument is valid.When we move on to study invalidity, however, we find that the situation is not parallel. Every argument is an instance of some invalid argument forms, and we cannot say that every instance of every invalid form is invalid.



    Upload a copy of this work     Papers currently archived: 91,088

External links

Setup an account with your affiliations in order to access resources via your University's proxy server

Through your library

Similar books and articles

Invalidity.Riccardo Guastini - 1994 - Ratio Juris 7 (2):212-226.
Fallaciousness and Invalidity.Charles J. Abaté - 1979 - Philosophy and Rhetoric 12 (4):262 - 266.
More on Fallaciousness and Invalidity.John Woods & Douglas Walton - 1981 - Philosophy and Rhetoric 14 (3):168 - 172.
Fallaciousness without Invalidity?John Woods & Douglas Walton - 1976 - Philosophy and Rhetoric 9 (1):52 - 54.
Boole's criteria for validity and invalidity.John Corcoran & Susan Wood - 1980 - Notre Dame Journal of Formal Logic 21 (4):609-638.
Wittgenstein's Concept of Showing.David Pears - 1992 - Grazer Philosophische Studien 42 (1):91-105.
Table of Contents.Uwe Meixner - 1992 - Theoria: Revista de Teoría, Historia y Fundamentos de la Ciencia 7 (2):1-2.


Added to PP

35 (#408,502)

6 months
3 (#550,572)

Historical graph of downloads
How can I increase my downloads?