Question

Suppose n and m are integers. Let H = {sm+tn|s ∈ Z and t ∈ Z}....

Suppose n and m are integers. Let H = {sm+tn|s ∈ Z and t ∈ Z}.
Prove that H is a cyclic subgroup of Z.

......................

Please help with clear steps that H is a cyclic subgroup of Z

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