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Def. S. 12Mit ℤ wird die Menge (ℕ × ℕ)/~ bezeichnet, für die Äquivalenzrelation(m_1, n_1) ~ (m_2, n_2) :⇔ m_1 + n_2 = m_2 + n_1.Wir betrachten ℤ als Erweiterung von ℕ, wobei n ∈ ℕ mit [(n, 0)] ∈ ℤ identifiziert wird.
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