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Ribet's theorem (earlier called the epsilon conjecture or ε-conjecture) is part of number theory. It concerns properties of Galois representations associated with modular forms. It was proposed by Jean-Pierre Serre and proven by Ken Ribet. The proof was a significant step towards the proof of Fermat's Last Theorem (FLT).
Kenneth Alan Ribet (/ ˈ r ɪ b ɪ t /; born June 28, 1948) is an American mathematician working in algebraic number theory and algebraic geometry.He is known for the Herbrand–Ribet theorem and Ribet's theorem, which were key ingredients in the proof of Fermat's Last Theorem, as well as for his service as President of the American Mathematical Society from 2017 to 2019.
The strategy that ultimately led to a successful proof of Fermat's Last Theorem arose from the "astounding" [137]: 211 Taniyama–Shimura–Weil conjecture, proposed around 1955—which many mathematicians believed would be near to impossible to prove, [137]: 223 and was linked in the 1980s by Gerhard Frey, Jean-Pierre Serre and Ken Ribet to ...
His article was published in 1990. In doing so, Ribet finally proved the link between the two theorems by confirming, as Frey had suggested, that a proof of the Taniyama–Shimura–Weil conjecture for the kinds of elliptic curves Frey had identified, together with Ribet's theorem, would also prove Fermat's Last Theorem.
In 1986, upon reading Ken Ribet's seminal work on Fermat's Last Theorem, Wiles set out to prove the modularity theorem for semistable elliptic curves, which implied Fermat's Last Theorem. By 1993, he had been able to convince a knowledgeable colleague that he had a proof of Fermat's Last Theorem, though a flaw was subsequently discovered.
Pages in category "Fermat's Last Theorem" The following 18 pages are in this category, out of 18 total. ... Ken Ribet; Ribet's theorem; S. Sophie Germain's theorem; T.
In the summer of 1986, Ken Ribet demonstrated that, just as Gerhard Frey had anticipated, a special case of the Taniyama–Shimura conjecture (still not proved at the time), together with the now proved epsilon conjecture (now called Ribet's theorem), implies Fermat's Last Theorem.
Fermat's theorem on sums of two squares is strongly related with the theory of Gaussian primes. A Gaussian integer is a complex number a + i b {\displaystyle a+ib} such that a and b are integers. The norm N ( a + i b ) = a 2 + b 2 {\displaystyle N(a+ib)=a^{2}+b^{2}} of a Gaussian integer is an integer equal to the square of the absolute value ...