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S. Wagstaff (1978)
The irregular primes to 125000Mathematics of Computation, 32
G. Faltings (1983)
Endlichkeitssätze für abelsche Varietäten über ZahlkörpernInventiones mathematicae, 73
(1984)
An application of Faltings" results to Fermat's Last Theorem
FERMAT'S LAST THEOREM FOR "ALMOST ALL" EXPONENTS D. R. HEATH-BROWN Fermat's Last Theorem—which we shall abbreviate to FLT—is the (as yet unproved) assertion that the Diophantine equation x" + y" — z" has no solutions in positive integers if 11 ^ 3. It would suffice to deal with the case in which n is prime, and this is where the most significant work has been done. None the less it is not yet known even whether FLT is true for infinitely many prime exponents. If one considers general exponents n one sees that FLT is true at least for a proportion 1-5 n 3 « p « 125000 of all n, since the cases n = 4 and n = p ^ 125000 (p =£ 2) are known to hold (Wagstaff [3]). The object of this note is to prove the following corollary to the recent work of Faltings [1] on Mordell's Conjecture. THEOREM. FLT is true for "almost all" exponents n. That is, ifN(x) is the number of n ^ x for which FLT fails, then N(x) = o{x) as x -*• 00. Unfortunately the proof, being based on Faltings' Theorem, is ineffective. Thus, given e > 0,
Bulletin of the London Mathematical Society – Wiley
Published: Jan 1, 1985
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