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#127086 - 04/07/04 10:45 AM ipse dixit
wwh Offline
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Registered: 01/18/01
Posts: 13858
The term ipse dixit is the Latin equivalent of the Greek autos epha,
referring to Pythagoras, as in, The master (Pythagoras) said it so it must
be true and no proof is needed. In our modern world, this has many forms:

Child: Why do I have to go to bed at eight every day?
Parent: Because I said so.

Employee: Why do we have to do this project if it's going to be scrapped anyway?
Boss: Because I said so.

An appeal to authority also known as argument from authority, argumentum ad verecundiam (Latin: argument from modesty) or ipse dixit (Latin: he himself, said it), is one method of obtaining propositional knowledge.

#127087 - 04/07/04 02:19 PM Re: ipse dixit
AnnaStrophic Offline
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Registered: 03/15/00
Posts: 6511
Loc: lower upstate New York
What's the difference in the usage of ipse dixit and quod erat demonstratum?

#127088 - 04/07/04 02:27 PM Re: ipse dixit
Faldage Offline
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Registered: 12/01/00
Posts: 13803
Ipse dixit would be said after a successful Proof by Blatant Assertion, quod erat demonstrandum after a real proof.

#127089 - 04/07/04 04:20 PM Re: ipse dixit
Capfka Offline

Registered: 06/28/02
Posts: 1624
Loc: Utter Placebo, Planet Reebok
Yup. "Because he says so" ain't QUITE "this is proven".

#127090 - 04/08/04 01:27 AM Re: ipse dixit
Bingley Offline
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Registered: 04/09/00
Posts: 3065
Loc: Jakarta
Actually quod erat demonstrandum doesn't mean 'this is proven', it means 'which was to be proved", i.e., this is what we had to prove. It implies 'and now we have proved it' but it doesn't mean that.


#127091 - 04/08/04 06:48 AM Re: ipse dixit
emanuela Offline

Registered: 03/16/00
Posts: 315
Loc: Italy - Perugia is a town with...
indeed, quod erat demonstrandum is usually said/written immediately after the last sentence in a proof, in which we have finished to prove what we had to prove

#127092 - 04/08/04 05:12 PM Re: ipse dixit
Capfka Offline

Registered: 06/28/02
Posts: 1624
Loc: Utter Placebo, Planet Reebok
I know, I know. But the "truth" didn't fit what I wanted to say exactly, so I newsmediaed it.


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