Fermat's last theorem (also known as Fermat's conjecture, or Wiles' theorem) states that no three positive integers x, y, z x,y,z x, y, z satisfy x n + y n = z n x^n + y^n = z^n x n + y n = z n for any integer n > 2 n>2 n …
For decades, the conjecture remained an important but unsolved problem in mathematics. Both Fermat's Last Theorem and the modularity theorem were almost universally considered inaccessible to proof by contemporaneous mathematicians, meaning that they were believed to be impossible to prove using current knowledge.

However, a copy was preserved in a book published by Fermat's son. Wiles found that when the representation of an elliptic curve using p=3 is reducible, it was easier to work with p=5 and use his new lifting theorem to prove that Wiles showed that in this case, one could always find another semistable elliptic curve Wiles opted to attempt to match elliptic curves to a Wiles had the insight that in many cases this ring In order to perform this matching, Wiles had to create a Wiles' use of Kolyvagin–Flach would later be found to be the point of failure in the original proof submission, and he eventually had to revert to Iwasawa theory and a collaboration with Richard Taylor to fix it.



The idea is that the Galois group acts first on the modular curve on which the modular form is defined, thence on the Instead of trying to go directly from the elliptic curve to the modular form, one can first pass to the In his 108-page article published in 1995, Wiles divides the subject matter up into the following chapters (preceded here by page numbers): Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Over the following years, The proof falls roughly in two parts. Less obvious is that given a modular form of a certain special type, a This goes back to Eichler and Shimura. Together with Ribet's theorem, it provides a proof for Fermat's Last Theorem. In 1985, In mathematical terms, Ribet's theorem showed that if the Galois representation associated with an elliptic curve has certain properties (which Frey's curve has), then that curve cannot be modular, in the sense that there cannot exist a modular form which gives rise to the same Galois representation.Following the developments related to the Frey Curve, and its link to both Fermat and Taniyama, a proof of Fermat's Last Theorem would follow from a proof of the Taniyama–Shimura–Weil conjecture — or at least a proof of the conjecture for the kinds of elliptic curves that included Frey's equation (known as However, despite the progress made by Serre and Ribet, this approach to Fermat was widely considered unusable as well, since almost all mathematicians saw the Taniyama–Shimura–Weil conjecture itself as completely inaccessible to proof with current knowledge.Hearing of Ribet's 1986 proof of the epsilon conjecture, English mathematician Andrew Wiles, who had studied elliptic curves and had a childhood fascination with Fermat, decided to begin working in secret towards a proof of the Taniyama–Shimura–Weil conjecture, since it was now professionally justifiableRibet later commented that "Andrew Wiles was probably one of the few people on earth who had the audacity to dream that you can actually go and prove [it]." This article was most recently revised and updated by

…to establish the truth of Fermat’s last theorem for a large class of prime exponents This existing result for p=3 is crucial to Wiles's approach and is one reason for initially using p=3. Around 50 years after first being proposed, the conjecture was finally proven and renamed the On yet another separate branch of development, in the late 1960s, Yves Hellegouarch came up with the idea of associating solutions (Such an elliptic curve would enjoy very special properties, which are due to the appearance of high powers of integers in its equation and the fact that Mathematically, the conjecture says that each elliptic curve with To complete this link, it was necessary to show that Frey's intuition was correct: that a Frey curve, if it existed, could not be modular.

So we can try to prove all of our elliptic curves are modular by using one prime number as The proof must cover the Galois representations of all semi-stable elliptic curves From above, it does not matter which prime is chosen for the representations.



Wiles aims first of all to prove a result about these representations, that he will use later: that if a semi-stable elliptic curve Proving this is helpful in two ways: it makes counting and matching easier, and, significantly, to prove the representation is modular, we would only have to prove it for one single prime number This is the most difficult part of the problem – technically it means proving that if the Galois representation Together, these allow us to work with representations of curves rather than directly with elliptic curves themselves.

His work was extended to a full proof of the modularity theorem over the following 6 years by others, who built on Wiles's work.

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Wiles's paper is over 100 pages long and often uses the specialised symbols and notations of Among the introductory presentations are an email which Ribet sent in 1993;Proof of a special case of the modularity theorem for elliptic curves
It spurred the development of entire new areas within Separately from anything related to Fermat's Last Theorem, in the 1950s and 1960s Japanese mathematician By around 1980, much evidence had been accumulated to form conjectures about elliptic curves, and many papers had been written which examined the consequences if the conjecture was true, but the actual conjecture itself was unproven and generally considered inaccessible - meaning that mathematicians believed a proof of the conjecture was probably impossible using current knowledge. In the first part, Wiles proves a general result about "We will set up our proof by initially seeing what happens if Fermat's Last Theorem is incorrect, and showing (hopefully) that this would always lead to a contradiction. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... …what is now known as Fermat’s last theorem—namely, that there are no rational solutions to

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