http://system.lm-ns.org/index.php/lm-ns/issue/feedLIBERTAS MATHEMATICA (new series)2024-07-14T11:21:57+00:00LM-NS Secretariatsecretariat@lm-ns.orgOpen Journal SystemsThis is the submission and reviewing management system. For the journal information please see <a href="http://www.lm-ns.org">http://www.lm-ns.org</a>http://system.lm-ns.org/index.php/lm-ns/article/view/1487Cover Pages2024-07-14T11:13:50+00:00Vasile Staicuvasile@ua.pt.2023-09-27T23:47:52+00:00http://system.lm-ns.org/index.php/lm-ns/article/view/1489Andrea Bacciotti2024-07-14T11:13:50+00:00Giuseppe Anichinigiuseppe.anichini@unifi.itLuciano Pandolfiluciano.pandolfi@polito.itIn memoriam: Andreia Bacciotti and his contributions2024-04-07T18:13:30+00:00http://system.lm-ns.org/index.php/lm-ns/article/view/1483Chaotic Dynamics in a Class of Switched Li\'{e}nard/Rayleigh Systems with Relativistic Acceleration2024-07-14T11:21:57+00:00Duccio Papiniduccio.papini@uniud.itGabriele Villarigabriele.villari@unifi.itFabio Zanolinfabio.zanolin@uniud.itWe consider a class of time-periodic switched systems, which are obtained as a perturbation of a planar autonomous reversible system by a periodic forcing term. The model is motivated by an extension of the classical Li\'{e}nard and Rayleigh equations due to the presence of a relativistic acceleration. Using recent results from the theory of topological horseshoes, we provide a new result of existence of infinitely many subharmonic solutions, as well as more complex dynamics, as illustrated by some numerical examples.2023-09-26T16:36:46+00:00http://system.lm-ns.org/index.php/lm-ns/article/view/1488Boundary Regional Controllability of Semilinear Systems Involving Caputo Time Fractional Derivatives2024-07-14T11:13:50+00:00Asmae Tajanitajaniasmae1993@gmail.comFatima-Zahrae El Alaouif.elalaoui@umi.ac.maDelfim F. M. Torresdelfim@ua.ptWe study boundary regional controllability problems for a class of semilinear fractional systems. Sufficient conditions for regional boundary controllability are proved by assuming that the associated linear system is approximately regionally boundary controllable. The main result is obtained by using fractional powers of an operator and the fixed point technique under the approximate controllability of the corresponding linear system in a suitable subregion of the space domain. An algorithm is also proposed and some numerical simulations performed to illustrate the effectiveness of the obtained theoretical results.2024-01-03T18:51:29+00:00http://system.lm-ns.org/index.php/lm-ns/article/view/1485New Inequalities for Operator Noncommutative Perspectives Related to Convex Functions2024-07-14T11:13:50+00:00Silvestru Sever Dragomirsever.dragomir@vu.edu.auIn this paper we obtain some new inequalities for operator noncommutative perspectives related to convex functions. Applications for weighted operator geometric mean and relative operator entropy are also given.2024-04-07T18:23:00+00:00http://system.lm-ns.org/index.php/lm-ns/article/view/1490Remembering Andrea Bacciotti2024-07-14T11:13:50+00:00Giuseppe Anichinigiuseppe.anichini@unifi.itRemembering the colleague, friend and mathematician2024-04-07T18:28:15+00:00http://system.lm-ns.org/index.php/lm-ns/article/view/1491Remembering Andrea2024-07-14T11:13:50+00:00Francesca Ceragiolifrancesca.ceragioli@polito.itAndrea remembered by a former student2024-04-07T18:43:05+00:00