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Anneaux quotients #159

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fabnicol opened this issue Jul 6, 2022 · 1 comment
Open

Anneaux quotients #159

fabnicol opened this issue Jul 6, 2022 · 1 comment

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@fabnicol
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fabnicol commented Jul 6, 2022

Dans la démonstration du ITEMooYBEGooTlHgNz du 1.211, il manque la vérification de la condition d'inversibilité pour la loi +, pour caractériser le groupe (A/I, +), qui est certes trivialement évidente mais non explicitée. Rajouter en dessous du (1.326):

[a] + [-a] = [a - a] = [0],
et l'on peut noter :
-[a] = [-a]
l'inverse de [a] dans (A/I, +).

@LaurentClaessens
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fait. merci

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