Formal Fallacies – Introduction

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Argument from Fallacy, fallacies, fallacy, formal fallacies, formal fallacy, Masked Man Fallacy, Probabilistic Fallacies, Propositional Fallacies, Quantification Fallacies, Syllogistic Fallacies

A formal fallacy is a pattern of reasoning which is rendered invalid due to a flaw in its logical structure which can neatly be expressed in standard system of logic, for example propositional logic. An argument that is formally fallacious is always considered to be wrong. Formal fallacies do not take into account the soundness of an argument, but rather its validity. Formal fallacies can also be referred as deductive fallacies.

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Traditional Square of Opposition

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categorical propositions, contradictory, contraposition, contrary, conversion, obversion, proposition, propositions, square of opposition, subaltern, subcontrary, traditional square of opposition

The Traditional Square of Opposition

The Traditional Square of Opposition is a diagram specifying logical relations among four types of categorical propositions. It is useful in the analysis of syllogistic logic, serving to identify the allowed logical conversions from one type to another.