Question Number 158537 by apriadodir last updated on 05/Nov/21
$$\mathrm{find}\:\mathrm{all}\:\mathrm{subgroup}\:\mathrm{of}\:\left(\mathrm{Z}_{\mathrm{7}} ,+\right)\: \\ $$
Commented by mkam last updated on 06/Nov/21
$${since}\:{Z}_{\mathrm{7}} \:{is}\:{a}\:{prime}\:{group}\:{then}\:{the}\:{sup}\:{group} \\ $$$${is}\:{a}\:{non}\:{trivial}\:{group}\:{z}_{\mathrm{7}} \:{and}\:\left\{\mathrm{0}\right\} \\ $$$$\left({M}.{T}\right) \\ $$