Show that `" "a` is not the inverse of `a in N` for the addition operation + on N and `1/a` is not the inverse of `a in N` for multiplication operation `xx` on N, for `a!=1` .

Explanation

We know that , for ` a in N - a in N `
Therefore,-a can not be the inverse of 'a' for '+' operation in N.
Similarly , for , ` a in N , (1)/(a) in N, if a ne 1`
Therefore , `(1)/(a)` can not be the inverse of 'a' for `'xx'` operation in N, if `a in 1`
Hence Proved.