FALLACY PAGE

— Tautology —

Fallacy definition (short name: tautology)

Definition

A tautology is an argument that utilizes circular reasoning, which means that the conclusion is also its own premise.

The structure of such arguments is

A=B
therefore A=B

although the premise and conclusion might be formulated differently so it is not immediately apparent as such.

Example

Saying that therapeutic touch works because it manipulates the life force is a tautology because the definition of therapeutic touch is the alleged manipulation (without touching) of the life force.

Source

From the skeptics guide website

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Forum

Differences with circular argumentation
posted by GhiOm on February 16, 2010 09:42

I’m wondering what are the differences between a circular argumentation and a tautology.
Anybody to gives some hints about this ?