proved or proven?
The past participles proved and proven are both often used as verbs, with auxiliaries, and also as predicative adjectives (after be). Whether to say, for example, We have proved our case or We have proven our case, and The case is proved or The case is proven is a matter of choice. Proved is not, however, ordinarily employed as an adjective preceding a noun: proven cases; a proven fact are the standard forms.
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