Question: 1. Soit A = Z Z et considerez la relation suivante sur A (a, b) (c, d) si ab = cd . (a) Montrez que

1. Soit A = Z Z et considerez la relation suivante sur A (a, b) (c, d) si ab = cd . (a) Montrez que est une relation d'equivalence sur A. (b) Determinez les classes d'equivalences induites par . Donnez tous les elements de A qui appartiennent `a [(2, 5)]

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