lousyd writes: "No less than the US Chief of Naval Operations has come out on the side of reviewing the policy of male-only submarine crews. Women make up approximately 12 percent of the 1.2 million U.S. service members on active duty. With women having served in the United States military throughout American history, the claustrophobic confines of the submarine force are one of the last frontiers for women warriors. Navy Secretary Ray Mabus said, "I believe women should have every opportunity to serve at sea, and that includes aboard submarines." As a former submariner myself, I say it's about time."
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"