<div dir="ltr"><div>Reenvio charla en el Dpto de Matematica. </div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">---------- Forwarded message ---------<br>De: <strong class="gmail_sendername" dir="auto">Francisco Martinez Peria</strong> <span dir="auto"><<a href="mailto:francisco@mate.unlp.edu.ar">francisco@mate.unlp.edu.ar</a>></span><br>Date: lun, 7 abr 2025 a la(s) 6:14 p.m.<br>Subject: Charla del Prof. Carsten Trunk<br>To: <<a href="mailto:all@mate.unlp.edu.ar">all@mate.unlp.edu.ar</a>>, Alumnos <<a href="mailto:alumnosm@gmail.com">alumnosm@gmail.com</a>>, graduados <<a href="mailto:grad@mate.unlp.edu.ar">grad@mate.unlp.edu.ar</a>>, <<a href="mailto:docentes@mate.unlp.edu.ar">docentes@mate.unlp.edu.ar</a>><br></div><br><br><div dir="ltr">Hola a todos,<div dir="auto"></div>
<div><br></div><div>Me complace invitarlos a la charla que dará el Prof.Carsten Trunk (TU Ilmenau, Alemania). La misma será mañana, martes 8 de abril a las 16.00 hs, en el aula 3 del Departamento.</div><div><br></div><div>El título de la charla es:</div><div><br></div><div><b>Limit point and limit circle criteria for Sturm-Liouville operators with complex coefficients</b></div><div><br></div><div>The crucial role for the study of deficiency indices of real Sturm-Liouville operators plays the classical result of H. Weyl (1910) about limit point and limit circle classification. In fact, it characterizes the number of L^2-solutions (one or two). It was extended by A.R. Sims in 1957 and later by B.M. Brown et al. (1999) to the case of Sturm-Liouville expression with complex coefficients. Here, we present a collection of various criteria which allow us to decide to which class of Sims’ scheme a given Sturm-Liouville problem with complex coefficients belongs. This is subsequently applied to a second order differential equation defined on a ray in the complex plane which is motivated by the recent intensive research connected with PT -symmetric Hamiltonians in non-hermitian Quantum Mechanics.<br></div><div><br></div><div>Saludos,</div><div>Francisco</div></div>
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