{"product_id":"9783034801621","title":"Critical Point Theory for Lagrangian Systems","description":"\u003cp\u003eLagrangian systems constitute a very important and old class in dynamics. Their origin dates back to the end of the eighteenth century, with Joseph-Louis Lagrange’s reformulation of classical mechanics. The main feature of Lagrangian dynamics is its variational flavor: orbits are extremal points of an action functional. The development of critical point theory in the twentieth century provided a powerful machinery to investigate existence and multiplicity questions for orbits of Lagrangian systems. This monograph gives a modern account of the application of critical point theory, and more specifically Morse theory, to Lagrangian dynamics, with particular emphasis toward existence and multiplicity of periodic orbits of non-autonomous and time-periodic systems.\u003c\/p\u003e","brand":"Springer Basel","offers":[{"title":"Default Title","offer_id":47034872955120,"sku":"9783034801621","price":129.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9783034801621_p0.jpg?v=1763711441","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9783034801621","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}