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From: Samuel DEVULDER <samuel_dot_devulder@laposte_dot_net.invalid>
Newsgroups: fr.sci.maths
Subject: Re: Puissance complexe
Date: Mon, 20 Dec 2021 23:52:12 +0100
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Le 20/12/2021 à 23:01, Julien Arlandis a écrit :

> sqrt(-1) = exp(i*(k+1/2)*pi) = {i, -i}               [1]
> -sqrt(-1) = -exp(i*(k+1/2)*pi) = {-i, i}   
> Et donc doit on en conclure que sqrt(-1) = -sqrt(-1) ?

En tant que fonction multivaluée je dirais que oui (même ensemble de 
valeurs produites en sorties.)