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The Fermat–Catalan Conjecture
open
· number theory · ~1 min read
· difficulty 5/5
The problem
Claim: there exists a constant C such that the equation \(x^p\) + \(y^q\) = \(z^r\) with x,y,z positive coprime integers and exponents satisfying 1/p + 1/q + 1/r < 1 has at most C primitive solutions (across all exponent triples). Currently ten solutions known, including 2³+1²=3² and 7³+13²=2⁹.
History & significance
Generalises both Fermat's Last Theorem (p=q=r case, our FLT entry) and Catalan's conjecture (consecutive perfect powers). Darmon and Granville proved finiteness for each FIXED triple (p,q,r) using Faltings' theorem on our historic shelf — but the claim requires a UNIFORM bound across all triples simultaneously, which needs effective height bounds that currently do not exist.
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References
Still open.
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