Ipse dixit

Cogito ergo sum Logic and rhetoric

Key articles

Logical fallacy Syllogism Argument

General logic

Authenticity of divine revelation Genuine but insignificant cause Confirmation bias دوراهی اشتباهی Viés de sobrevivência Paulo Bittencourt

Bad logic

Confusion of the inverse Loaded language Affirming a disjunct Gambler's fallacy Magical thinking Argument from ignorance v - t - e

“”If you need to invoke your academic pedigree or job title for people to believe what you say, then you need a better argument.

—Neil deGrasse Tyson

Ipse dixit is a Latin phrase meaning "He himself said it." It refers to what is basically an appeal to authority, with oneself as the authority. In other words, the perpetrator of an ipse-dixitism makes an unfounded assertion and expects his word to be the final say.

For example, Richard Mains asserts a privileged perspective because of his work in space industry without explaining the logic of the relationship between his claims and his claimed experience.

Good old Ayn Rand used her genius to take ipse dixit to a quite superior level by quoting herself as an expert indirectly via some of her own made-up characters in novels. For instance, her book The Virtue of Selfishness states at the beginning, "Since I am to speak on the Objectivist Ethics, I shall begin by quoting its best representative — John Galt…" John Galt is a fictitious character in Rand's novel Atlas Shrugged.

Form

A says that X is true.

P2: (implicit) A gets to decide because A is an expert.

C: X is true.

See also

• Argument by assertion
• Vicarious autotheism

External links

• False Authority

References

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