Periodic Harmonic Functions on Lattices with Values in a Positive Characteristic Field and Points Count on an Algebraic Variety
نویسنده
چکیده
Abstract. We consider a Caley graph Γ of a free abelian group (i.e. a lattice) and harmonic functions on Γ with values in a field K of positive characteristic. We are interested in pluri-periodic such functions. Which pluri-periods can occur? This question arises naturally, in the characteristic 2 case, in relation with the game ”Lights out” on a rectangular or a toric board, or otherwise in studing the dynamics of linear cellular automata on a lattice Λ. We present two possible reductions of this problem. The first one deals with the Chebyshev-Dickson polynomials and their generalizations. The second one leads to points count on a certain affine algebraic variety Σ over the algebraic closure of K. The points on Σ correspond to harmonic characters on Λ. We express the pluri-periods of harmonic functions on Λ, or (which is the same) the sizes of the toric boards obstructed for the ”Lights Out” game, as torsion multi-orders of the corresponding points on Σ.
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تاریخ انتشار 2007