``A Positive Proof of Ulam's Conjecture ver.3''
Sabu RYÔKAWA (1980?--, Japan)
November 10, 2002
Ulam's Conjecture (Stanisław Marcin Ulam, 1909–84) had been an unsettled problem in graph theory. We concisely solved it at any directed graph under highlevel abstraction.
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Copyright © 2001–2002, Sabu Ryokawa. Some rights reserved. NOT FOR SALE
We altered E. M. to XM. We found two significant errors. At "Isomorphic Matrix," corrected M x N to X x Y . At "Label of Vertex," corrected V,E to V,W.
Jorg and John Maloney's cheerful e-mails were reached. . Thank you.
When the author got troubles about writting this paper, it was helpful to find software W32TeX by A. Kakuto at Kinki University.
Material  is a famous mathematical dictionary in Japan.
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