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:''Main article: [[tautology]]''

:''Main article: [[tautology]]''

A [[tautology]] ([[Greek]] '''ταυτα''' ''tauta'', "these") is an argument that becomes a repetition of a definition. Literally it means "the study of this" or "the study of these." Such an argument, or statement, can prove nothing beyond itself and is useless as a premise.

A [[tautology]] ([[Greek]] '''ταυτο-''' ''tauto-'', "the same") is an argument that becomes a repetition of a definition. Literally it means "the study of the same." Such an argument, or statement, can prove nothing beyond itself and is useless as a premise.

==Fallacies of Ambiguity==

==Fallacies of Ambiguity==