... control) are studied in the first part of the book• Ortega R. , Lor´ a A., Nicklasson P. J. and Sira-Ram´ırez H., 19 98, “Passivity-based control of Euler-Lagrange Systems Mechanical, Electrical and ... control of robot manipula-tors”, Second Edition, Springer-Verlag, London.2 .1 Linear Algebra 23Obviously, any diagonal matrix is symmetric. In the particular case when a 11 = a 22= ··· = a nn= ... control, variable-structure control, learning control, fuzzy control and neural-networks-based. These topics, which demand a deeper knowledge of control and stability theory, may make part of a secondcourse...