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Morishima published at least thirteen papers, including his work on Fermat"s Last Theorem. and a collected works volume published in 1990 after his death. He also corresponded several times with American mathematician H. South. Vandiver. Let m be a prime number not exceeding 31.
Let p be prime, and let x, y, z be integers such that xp + yp + zp = 0.
Assume that p does not divide the product xyz. Then, p² must divide mp − 1-1.
Granville wrote that Morishima"s proof could not be accepted.
