Fractal Signals

"Fractal" term - which in Latin language defines something fragmented anomalous - was introduced in mathematics by B. B. Mandelbrot in 1975. He avoided to define it rigorously and used it to designate some "rugged" and "self-similar" geometrical forms. Fractals were involved in the theory of chaotic dynamic systems and used to designate certain specific sets; finally, they were "captured" by geometry and remarked in tackling of the boundary problems. It proved that the fractals can be of interest even in the signal\´s theory.