In this paper, a fuzzy version of the analytic form of Hahn-Banachextension theorem is given. As application, the Hahn-Banach theorem for$r$-fuzzy bounded linear functionals on $r$-fuzzy normedlinear spaces is obtained.

‎in this paper we study the existence of nontrivial‎ solutions for a variational inequality on the half-line‎. ‎our‎ ‎approach is based on the non-smooth critical point theory‎ ‎for szulkin-type functionals.

In this article, we characterize the global asymptotic and exponential stability of nonlinear switching retarded systems through direct converse Lyapunov-Krasovskii theorems. Thanks to these theorems, a link between an unforced system input-to-state property is obtained. An example illustrating applicability our results given.

The conditions under which, multilinear forms (the symmetric case and the non symmetric case),can be written as a product of linear forms, are considered. Also we generalize a result due to S.Kurepa for 2n-functionals in a group G.

In this brief, the problem of exponential dissipativity of discrete-time switched system with time-varying delays is proposed by using the average dwell time approach and multiple Lyapunov-Krasovskii functional (LKF).