# la preuve par neuf

## English translation: definitive test

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 18:07 Nov 10, 2001
French to English translations [PRO]
 French term or phrase: la preuve par neuf the acid test? It's part of a complex sentence outlining a logical argument.
 Guy BrayUnited States Local time: 15:23
 English translation:definitive test Explanation:In Italian we use exactly the same phrase (with Italian words, of course!. But according to my dictionary there isn't an equivalent phrase in English, so it suggests: definitive test. Unless we were talking about maths... By the way, I am a native bi-lingual (French-Italian)
Selected response from:

Giuseppina Vecchia
Italy
Local time: 00:23
 4 KudoZ points were awarded for this answer

4definitive test
 Giuseppina Vecchia
2 +2casting out ninesWWright454
4cast out of the nines

21 mins   confidence:
cast out of the nines

Explanation:
technique rapide qui permet de contrôler s'il y a une erreur dans le résultat d'une opération mathématique
en langue courante signifie "preuve absolue si l'on raisonne bien"

 Rita CavaianiLocal time: 18:23Native speaker of: French, ItalianPRO pts in pair: 55
 I'm not looking for the test, but a metaphor based on it
Comment: I'm not looking for the test, but a metaphor based on it

56 mins   confidence: peer agreement (net): +2
casting out nines

Explanation:
I think literally translated it would be casting out nines.

Preuve par 9. - Technique utilisée pour vérifier si le résultat de certaines opérations est exact et qui consiste à calculer les résidus de nombres. Le résidu est un nombre d’un seul chiffre issu de l’addition des chiffres d’un entier naturel et de la répétition, au besoin, de l’addition des chiffres du dernier résultat obtenu. Le résidu de 528 est 6 (5 + 2 + 8 = 15 et 1 + 5 = 6).

To cast out the nines you add the digits of your numbers together until you end up with a single digit. So if one of your numbers were 8236, then you cast out the nines by adding 8 + 2 + 3 + 6 = 19. You continue with this until you end up with one digit. So 19 becomes 1 + 9 = 1.

http://www.gomath.com/Questions/question.asp?question=1061

Reference: http://www.math.unicaen.fr/~reyssat/dico/dicoaf.html
Reference: http://www.recreomath.qc.ca/lex_neuf_p.htm
 WWright454United StatesLocal time: 17:23Native speaker of: English, FrenchPRO pts in pair: 12
 thanks but I want a metaphor, not the test itself

agree  xxxAbu Amaal: this is the correct English phrase, a traditional expression (metaphor for cross-checking, not exactly acid test)
 1 hr

agree
 16 hrs
Comment: thanks but I want a metaphor, not the test itself

15 hrs   confidence:
definitive test

Explanation:
In Italian we use exactly the same phrase (with Italian words, of course!. But according to my dictionary there isn't an equivalent phrase in English, so it suggests: definitive test.
Unless we were talking about maths...
By the way, I am a native bi-lingual (French-Italian)

 Giuseppina VecchiaItalyLocal time: 00:23Native speaker of: French, ItalianPRO pts in pair: 24

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