“…Hybrid systems sometimes incorporates also logic switching rules, [15,34] or the use of numerical tools, [28]. They offer a wide range of models for applications in the fields of robotics, compartmental dynamic models, control of DC or induction servomotors, Fuzzy systems, neural networks or computational techniques (see, for instance, [2,18,19,22,25,26,27,30,36,37]). In particular, the use of so-called hybrid functions (block-pulse functions plus Legendre polynomials) is of usefulness in the analysis and optimal control of linear delay systems, [27].…”