{"paper":{"title":"An application of the symplectic argument to some Fermat-type Equations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.NT","authors_text":"Alain Kraus, Nuno Freitas","submitted_at":"2016-06-14T13:56:29Z","abstract_excerpt":"Let $p$ be a prime number. In the early 2000s, it was proved that the Fermat equations with coefficients \\[3x^p + 8y^p + 21z^p =0\\quad \\text{ and } \\quad 3x^p + 4y^p + 5z^p=0 \\] do not admit non-trivial solutions for a set of exponents $p$ with Dirichlet density ${1/4}$ and ${1/8}$, respectively. In this note, using a recent criterion to decide if two elliptic curves over $\\mathbb{Q}$ with certain types of additive reduction at 2 have symplectically isomorphic $p$-torsion modules, we improve these densities to ${3/8}$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.04374","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}