Concrete numerical examples of quadratic differential systems having three limit cycles surrounding one singular point are shown. In case another finite singular point also exists, a (3, 1)… (More)

ÐBy studying the periodic drawings of the Dutch Artist M.C. Escher, we ®nd that the simplest group of the seventeen wallpaper group, P1, can be `visualized' in the upper halfplane as a symmetrical… (More)

Automatic generation of colored patterns in the hyperbolic 3-space is considered from a dynamical system's point of view. The symmetries of various two-dimensional cross-sections of a tessellation… (More)

Automatic generation of coloured patterns with symmetry of the modular group is considered from a dynamical system’s point of view. An equivariance property is imposed on dynamical systems to exhibit… (More)

A method for constructing the general M (Mandelbrot) set of a non-analytic mapping is presented. The equivariant mapping with symmetry of the modular group is considered as an illustration. By… (More)

RATIONALE
Posterior reversible encephalopathy syndrome (PRES), which diagnosis is based on clinical symptoms and radiological features, is a neurotoxic disease characterized by a set of clinical… (More)