The conjecture that Frey's elliptic curve was not modular. The conjecture was quickly proved by Ribet (Ribet's theorem) in 1986, and was an important step in the proof of Fermat's last theorem from the Taniyama-Shimura conjecture.
See alsoFermat's Last Theorem, Ribet's Theorem, Taniyama-Shimura Conjecture
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Cite this as:
Weisstein, Eric W. "Epsilon Conjecture." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EpsilonConjecture.html