Determine Whether the Following Argument Is Valid

Short Answer

Determine whether the following argument is valid. Name the rule of inference or the fallacy. $$\text { If } n \text { is a real number such that } n > 1 \text {, then } n ^ { 2 } > 1 \text {. Suppose that } n ^ { 2 } > 1 \text {. Then } n > 1 \text {. }$$