  For any Tychonoff space X we have introduced the zero-set in-tersection graph
on {\Gamma}(C+(X)) and studied the graph properties in connection with the
algebraic properties of the semiring C+(X). We have shown that for any two
realcompact spaces X and Y the graph isomorphism between {\Gamma}(C+(X)) and
{\Gamma}(C+(Y )), the semiring isomorphism between C+(X) and C+(Y ), the
topological homeomorphism between X and Y, the ring isomorphism between C(X)
and C(Y ) and the graph isomorphism between {\Gamma}(C(X)) and {\Gamma}(C(Y ))
are equivalent.
