Proceedings of the National Academy of Sciences of the United States of America, Vol. 54, No. 2 (Aug. 15, 1965), pp. 351-354 (4 pages) ...
This is a preview. Log in through your library . Journal Information This monthly journal, published since 1900, is devoted entirely to research in pure and applied mathematics, and, in general, ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback