Q- module or not ?
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Q- module or not ?
Is there any multiplication \(\displaystyle{\cdot:\mathbb{Q}\times \mathbb{Z}\longrightarrow \mathbb{Z}}\)
which gives to the abelian group \(\displaystyle{\left(\mathbb{Z},+\right)}\) a \(\displaystyle{\mathbb{Q}}\) - module structure ?
which gives to the abelian group \(\displaystyle{\left(\mathbb{Z},+\right)}\) a \(\displaystyle{\mathbb{Q}}\) - module structure ?
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