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Prop. 1.11Die Formeln a/b + a'/b' := (a⋅b' + a'⋅b)/(b⋅b')unda/b ⋅ a'/b' := (a⋅a')/(b⋅b')definieren die Verknüpfungen +: ℚ × ℚ → ℚ und ⋅: ℚ × ℚ → ℚ, so dass ℚ ein Körper und die Erweiterung ℤ → ℚ ein Homomorphismus von Ringen mit Eins ist.
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