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Automorphic forms for PGL(3) over elliptic function fields. Part 1: Graphs of Hecke operators
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This is a first part of a series of papers in which we develop explicit computational methods for automorphic forms for GL(3) and PGL(3) over elliptic function fields. In this first part, we determine explicit formulas for the action of the Hecke operators on automorphic forms on GL(2) and GL(3) in terms of their graphs. Our primary result consists in a complete description of the graphs of degree 1 Hecke operators for GL(3). As complementary results, we describe the 'even component' of the graphs of degree 2 Hecke operators for GL(2) and the 'neighborhood of the identity' of the graphs of degree 2 Hecke operators for GL(3). In addition, we establish two dualities for Hecke operators for GL(n) and PGL(n), which hold for all n, all degrees and all function fields.
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