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Bifurcation Chaos"],"published-print":{"date-parts":[[2017,1]]},"abstract":"<jats:p> This paper provides a theoretical background for Lagrangian Descriptors (LDs). The goal of achieving rigorous proofs that justify the ability of LDs to detect invariant manifolds is simplified by introducing an alternative definition for LDs. The definition is stated for [Formula: see text]-dimensional systems with general time dependence, however we rigorously prove that this method reveals the stable and unstable manifolds of hyperbolic points in four particular 2D cases: a hyperbolic saddle point for linear autonomous systems, a hyperbolic saddle point for nonlinear autonomous systems, a hyperbolic saddle point for linear nonautonomous systems and a hyperbolic saddle point for nonlinear nonautonomous systems. We also discuss further rigorous results which show the ability of LDs to highlight additional invariants sets, such as [Formula: see text]-tori. These results are just a simple extension of the ergodic partition theory which we illustrate by applying this methodology to well-known examples, such as the planar field of the harmonic oscillator and the 3D ABC flow. Finally, we provide a thorough discussion on the requirement of the objectivity (frame-invariance) property for tools designed to reveal phase space structures and their implications for Lagrangian descriptors. <\/jats:p>","DOI":"10.1142\/s0218127417300014","type":"journal-article","created":{"date-parts":[[2017,2,10]],"date-time":"2017-02-10T09:42:17Z","timestamp":1486719737000},"page":"1730001","source":"Crossref","is-referenced-by-count":85,"title":["A Theoretical Framework for Lagrangian Descriptors"],"prefix":"10.1142","volume":"27","author":[{"given":"C.","family":"Lopesino","sequence":"first","affiliation":[{"name":"Instituto de Ciencias Matem\u00e1ticas, CSIC-UAM-UC3M-UCM, C\/Nicol\u00e1s Cabrera 15, Campus Cantoblanco UAM, 28049 Madrid, Spain"}]},{"given":"F.","family":"Balibrea-Iniesta","sequence":"additional","affiliation":[{"name":"Instituto de Ciencias Matem\u00e1ticas, CSIC-UAM-UC3M-UCM, C\/Nicol\u00e1s Cabrera 15, Campus Cantoblanco UAM, 28049 Madrid, Spain"}]},{"given":"V. 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