{ "id": "0812.3014", "version": "v2", "published": "2008-12-16T09:56:48.000Z", "updated": "2009-06-25T12:37:42.000Z", "title": "On the classification of degree 1 elliptic threefolds with constant $j$-invariant", "authors": [ "Remke Kloosterman" ], "comment": "A new proof for Proposition 3.5 is provided; several minor changes", "categories": [ "math.AG" ], "abstract": "We describe the possible Mordell-Weil groups for degree 1 elliptic threefold with rational base and constant $j$-invariant. Moreover, we classify all such elliptic threefolds if the $j$-invariant is nonzero. We can use this classification to describe a class of singular hypersurfaces in $\\Ps(2,3,1,1,1)$ that admit no variation of Hodge structure.", "revisions": [ { "version": "v2", "updated": "2009-06-25T12:37:42.000Z" } ], "analyses": { "keywords": [ "elliptic threefold", "classification", "singular hypersurfaces", "rational base", "hodge structure" ], "note": { "typesetting": "TeX", "pages": 0, "language": "en", "license": "arXiv", "status": "editable", "adsabs": "2008arXiv0812.3014K" } } }