Let n ≥ 2. A Jacobson graph over ℤ
n
is a graph with vertex set all elements in ℤ
n
except elements in its Jacobson radical, and x and y are adjacent if and only if 1 − xy is not relative prime to n. In this paper, we give a characterization of Jacobson graph over ℤ
n
as a foundation for Jacobson graph over a finite commutative ring.
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