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Experimental Mathematics: Eigenfunctions of the discrete lapacian
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The image on the left shows a radial eigenfunction of the adjacency operator on the Euclidean plane over the finite field with 71 elements. The image on the right shows an eigenfunction of the adjacency operator on the hyperbolic plane over the same field. See Audrey Terras, Experimental Mathematics 5 (1996), 15-32.
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