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The mountain pass theorem is an existence theorem from the calculus of variations. Given certain conditions on a function, the theorem demonstrates the existence of a saddle point. The theorem is unusual in that there are many other theorems regarding the existence of extrema, but few regarding saddle points. == Theorem statement == The assumptions of the theorem are: * ''I'' is a functional from a Hilbert space ''H'' to the reals, * and is Lipschitz continuous on bounded subsets of ''H'', * ''I'' satisfies the Palais-Smale compactness condition, * , * there exist positive constants ''r'' and ''a'' such that if , and * there exists with such that . If we define: : and: : then the conclusion of the theorem is that ''c'' is a critical value of ''I''. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「mountain pass theorem」の詳細全文を読む スポンサード リンク
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