Abstract
Let f be a self-dual Hecke-Maass cusp form for GL(3). We show that f is uniquely determined by central values of GL(2) twists of its L-function. More precisely, if g is another self-dual GL(3) Hecke-Maass cusp form such that for all holomorphic Hecke eigenforms for all k ≡ 0 (mod 4), then f = g.
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