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A enneagonal tiling of the plane is proposed. A self-sirnilar pattern is obtained by using eight basic shapes. This pattern presents rotational symmetry and no translational invariance. ' ) C.P. 702, CEP 30.161-970. Belo Horizontc, Brazil. ') CEP 36.570.000, ViGosa (MG). Brazil.

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3D Ising model thermodynamic functions are evaluated through a variational approach in which the partition function is taken as product of different direction linear chain partition functions.Die thermodynamischen Funktionen des 3D-Isingmodells werden mittels eines Variationsverfahrens berechnet, bei dem die Verteilungsfunktion als Produkt von Verteilungsfunktionen hearer Ketten unterschiedlicher Richtung angenommen wird.

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