We obtain criteria for equivalence, covariance, commutativity, and idempotent additivity of roundings in ordered topological spaces. For some special classes of spaces, we obtain the characterization of roundings as extreme points of the set of nonenlarging isotone mappings and prove their Hyers-Ulam stability. A functional model of interval rounding is constructed.
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Shawnee State Univ, Dept Math, Portsmouth, OH 45662 USAShawnee State Univ, Dept Math, Portsmouth, OH 45662 USA
Li, Jinlu
Wang, Yuehu
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Nanjing Univ Finance & Econ, Sch Management Sci & Engn, Nanjing 210023, Peoples R ChinaShawnee State Univ, Dept Math, Portsmouth, OH 45662 USA
Wang, Yuehu
Wen, Ching-Feng
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Kaohsiung Med Univ, Ctr Fundamental Sci, Kaohsiung 80708, Taiwan
Kaohsiung Med Univ, Res Ctr Nonlinear Anal & Optimizat, Kaohsiung 80708, Taiwan
Kaohsiung Med Univ, Dept Med Res, Kaohsiung Med Univ Hosp, Kaohsiung 80708, TaiwanShawnee State Univ, Dept Math, Portsmouth, OH 45662 USA
Wen, Ching-Feng
Yao, Jen-Chih
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Natl Sun Yat Sen Univ, Dept Appl Math, Kaohsiung, TaiwanShawnee State Univ, Dept Math, Portsmouth, OH 45662 USA
Yao, Jen-Chih
Zhang, Congjun
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Nanjing Univ Finance & Econ, Sch Appl Math, Nanjing 210023, Peoples R ChinaShawnee State Univ, Dept Math, Portsmouth, OH 45662 USA