By M. Sion

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**Example text**

In ornamental art, the circle a leading element, either as independent or in combination with concentric circles, or as the basis upon which some concentric rosette of a lower degree of symmetry can be added. In such a desymmetrization, the newly formed rosette—the result of the superposition— possesses the symmetry of the rosette that has caused the desymmetrization. In this process, the circle plays the role of the neutral element. Among the symmetry groups of the type D n (nm), the group Di (m) is most frequent in ornamental art.

J u s t like a reflection, for which each point of the reflection line is invariant, an inversion maintains invariant each point of the inversion circle. By discussing a line as a circle with an infinite radius (and treating as circles, at the same time and under the same term, circles and lines) it is possible to identify reflections with circle inversions. e. transformations mapping circles (including lines) onto circles. Introduction 24 Fig. 12 Circle inversion. Besides the circle inversion Ri, by composing it with isometries maintaining invariant the circle line c of the inversion circle c(0, r)—with a reflection with reflection line containing the circle center O or with a rotation with the rotation center O, we have two more conformal transformations: (i) inversive reflection Zj = RjR = RRi, the involutional transformation, the commutative composition of a reflection and a circle inversion; (ii) inversive rotation Si = SRi = RiS, the commutative composition of a rotation and a circle inversion (Fig.

Five different symmetry types of plane lattices bear the name of Bravais lattices; the points of these lattices are defined by five different isohedral tessellations, which consist of parallelograms, rhombuses, rectangles, squares or regular hexagons. To Bravais lattices correspond the crystal systems of the same names (Fig. 10). Because the symmetry groups of friezes G21 are groups of isometries of the plane E2 with an invariant line, they cannot have rotations of an order greater than 2. For the symmetry groups of ornaments G^ so-called crystallographic restriction holds, according to which symmetry groups of ornaments can have only rotations of the order n=l,2,3,4,6.