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One of the shortest papers ever published is probably John Milnor's Eigenvalues of the Laplace Operator on Certan Certain Manifolds, Proceedings of the National Academy of Sciences of USA, 1964, p. 542

He shows that a compact Riemannian manifold is not characterized by the eigenvalues of its Laplacian. It takes him little more than half of a page.

show/hide this revision's text 1 [made Community Wiki]

One of the shortest papers ever published is probably John Milnor's Eigenvalues of the Laplace Operator on Certan Manifolds, Proceedings of the National Academy of Sciences of USA, 1964, p. 542

He shows that a compact Riemannian manifold is not characterized by the eigenvalues of its Laplacian. It takes him little more than half of a page.