Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |

Philosophy Index: Aesthetics · Epistemology · Ethics · Logic · Metaphysics · Consciousness · Philosophy of Language · Philosophy of Mind · Philosophy of Science · Social and Political philosophy · Philosophies · Philosophers · List of lists

In logic, the argument form or test form of an argument results from replacing the different words, or sentences, that make up the argument with letters, along the lines of algebra; the letters represent logical variables. This is of importance since the validity of an argument is determined soley by its form. The sentence forms which classify argument forms of common important arguments are studied in logic.

Example[edit | edit source]

To demonstrate the important notion of the form of an argument, substitute letters for similar items throughout the sentences in the original argument.

Original argument
All humans are mortal.
Socrates is human.
Therefore, Socrates is mortal.
Argument Form
All S are P.
a is S.
Therefore, a is P.

All we have done in the Argument form is to put 'S' for 'human' and 'humans', 'P' for 'mortal', and 'a' for 'Socrates'; what results, is the form of the original argument. Moreover, each individual sentence of the Argument form is the sentence form of its respective sentence in the original argument.[1]

Importance[edit | edit source]

Attention is given to argument and sentence form, because form is what makes an argument valid or cogent. Some examples of valid argument forms are modus ponens, modus tollens, and the disjunctive syllogism. Two invalid argument forms are affirming the consequent and denying the antecedent.

References[edit | edit source]

  1. Hurley, Patrick J. (1988). A concise introduction to logic, Belmont, Calif.: Wadsworth Pub. Co..

See also[edit | edit source]

This page uses Creative Commons Licensed content from Wikipedia (view authors).
Community content is available under CC-BY-SA unless otherwise noted.