عنوان	Cardinal Pseudospectral method for solving the periodic and semiperiodic Sturm–Liouville problem
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Chebyshev cardinal function, Eigenvalues, Eigenfunctions, Numerical methods, Periodic and semiperiodic Sturm–Liouville Problem
چکیده	This paper investigates the periodic and semiperiodic Sturm–Liouville problem. We begin by examining the fundamental properties of its eigenvalues and eigenfunctions. In the first part, the eigenvalues are approximated utilizing the pseudospectral method using the Chebyshev cardinal functions. While existing literature predominantly focuses on numerical and theoretical analysis of the eigenvalues, this study, in its second part, shifts focus to the eigenfunctions themselves. For both periodic and semiperiodic cases, we demonstrate that the explicit computation of these eigenfunctions is achievable. The methodology involves formulating the problem into the Volterra integral equation, which is then solved numerically via the pseudospectral method. Finally, the numerical results are rigorously validated by comparing them with analytical solutions. Error terms at both the inception and termination of the interval are calculated and bench marked against exact results, confirming the accuracy and efficacy of the proposed method.
پژوهشگران	محمد شهریاری (نفر اول)، اعظم مسعودی (نفر دوم)، بهزاد نعمتی سرای (نفر سوم)