Abstract
By free oscillations we refer to those oscillations that occur in the absence of an external exciting load \( f = f(x,t) = 0 \) and deformation caused by external causes \( e = e(x,t) = 0, \) where, as before, x is the coordinate of a point in the region \( \Omega \) occupied by the elastic body and t is time.
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Lusternik, L. A., & Sobolev, V. J. (1968). Elements of functional analysis (411 pp). Gordon and Breach.
Smirnov, V. I. (1964). Course of higher mathematics (Vol. IV, 336 pp). Oxford: Pergamon Press.
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Fridman, V. (2018). Spectral Theory. In: Theory of Elastic Oscillations. Foundations of Engineering Mechanics. Springer, Singapore. https://doi.org/10.1007/978-981-10-4786-2_3
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DOI: https://doi.org/10.1007/978-981-10-4786-2_3
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