Is the following correct?
The infinite group of integers $\Bbb Z$ under the operation of addition is a free abelian group with generator $1$. The subgroup $2\Bbb Z$ is also cyclic (with generator $2$) and thus the same rank as $\Bbb Z$.
Is the following correct?
The infinite group of integers $\Bbb Z$ under the operation of addition is a free abelian group with generator $1$. The subgroup $2\Bbb Z$ is also cyclic (with generator $2$) and thus the same rank as $\Bbb Z$.
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