Question: 4. (15 points) Let T and T be two spanning trees of a connected graph G. Suppose that an edge e is in T but

4. (15 points) Let T and T be two spanning trees

4. (15 points) Let T and T be two spanning trees of a connected graph G. Suppose that an edge e is in T but not in T'. Show that there is an edge e' in T', but not in T, such that (T _ {c)) U {e'} and (T' _ {e'}) U {c) are spanning trees of G

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