Sehie Park
The National Academy of Sciences, Republic of Korea, Seoul 06579, and Department of Mathematical Sciences, Seoul National University, Seoul 08826, Korea.
In our previous works, a Metatheorem in ordered fixed point theory showed that certain maximal element principles can be reformulated to various types of fixed point theorems for progressive maps and conversely. Therefore, there should be dual principles related to minimality, anti-progressive maps, and others. In the present article, we derive several minimal element principles particular to the Metatheorem and their applications. One such application is the Brøndsted–Jachymski Principle. We show that known examples due to Zorn (1935), Kasahara (1976), Brézis–Browder (1976), Tasković (1989), Zhong (1997), Khamsi (2009), Cobzaș (2011), and others can be improved and strengthened by our new minimal element principles.
Keywords: The 2023 Metatheorem, Brøndsted–Jachymski Principle, Zorn’s Lemma, Caristi fixed point theorem, Ekeland variational principle, preorder fixed point, stationary point, minimum principle.
Park, S. (2023). Applications of several minimum principles. Advances in the Theory of Nonlinear Analysis and its Application , 7 (1), 52-60.