Riv. Mat. Univ. Parma, Vol. 13, No. 1, 2022
Pietro Corvaja [a]
On the local-to-global principle for value sets
Pages: 47-72
Received: 6 July 2021
Accepted in revised form: 12 October 2021
Mathematics Subject Classification: 11D99, 11R09, 11G35.
Keywords: Local global principle, Diophantine equations.
Authors address:
[a]: Dipartimento di Scienze Matematiche, Informatiche e Fisiche, Università di Udine, Via delle Scienze 206, 33100 Udine, Italy.
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Abstract:
We consider the following problem: given a morphism \( \mathcal Y\to \mathcal X \) of algebraic curves over a number field \(k\),
describe the rational points \(x\in \mathcal X (k)\) lifting locally at every place to some rational point on \(\mathcal Y\),
but admitting no rational pre-image. In particular, we provide examples where there exist infinitely many such points.
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