On graphic elementary lifts of graphic matroids

An elementary lift of a binary matroid M that arises from coextension can easily be obtained by applying the splitting operation on M. This graphic may not produce matroid. We give method to determine forbidden minors for class matroids such any set k elements is again Using this method, we obtain k=2,3,4. One compute k≥5. As consequence, whose all lifts via coextensions are also graphic. There six minors.