On a Cauchy-Jensen functional inequality.
Najati, Abbas, Lee, Jung-Rye, Park, Choonkil (2010)
Bulletin of the Malaysian Mathematical Sciences Society. Second Series
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Najati, Abbas, Lee, Jung-Rye, Park, Choonkil (2010)
Bulletin of the Malaysian Mathematical Sciences Society. Second Series
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Wang, Jian (2003)
International Journal of Mathematics and Mathematical Sciences
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Roh, Jaiok, Chang, Ick-Soon (2008)
Abstract and Applied Analysis
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Lee, Jung Rye, Park, Choonkil, Shin, Dong Yun (2008)
Journal of Inequalities and Applications [electronic only]
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Park, Choonkil, Cho, Young Sun, Han, Mi-Hyen (2007)
Journal of Inequalities and Applications [electronic only]
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Jung, Soon-Mo, Kim, Byungbae (2003)
International Journal of Mathematics and Mathematical Sciences
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Janusz Matkowski (2003)
Open Mathematics
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In [4], assuming among others subadditivity and submultiplicavity of a function ψ: [0, ∞)→[0, ∞), the authors proved a Hyers-Ulam type stability theorem for “ψ-additive” mappings of a normed space into a normed space. In this note we show that the assumed conditions of the function ψ imply that ψ=0 and, consequently, every “ψ-additive” mapping must be additive
Cho, Young-Sun, Kim, Hark-Mahn (2007)
Abstract and Applied Analysis
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Najati, Abbas, Cho, Yeol Je (2011)
Fixed Point Theory and Applications [electronic only]
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Jun, Kil-Woung, Lee, Yang-Hi, Lee, Juri (2008)
Journal of Inequalities and Applications [electronic only]
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Moghimi, M.B., Najati, Abbas, Park, Choonkil (2009)
Advances in Difference Equations [electronic only]
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Park, Choonkil (2008)
Journal of Inequalities and Applications [electronic only]
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Najati, Abbas, Rahimi, Asghar (2009)
Acta Universitatis Apulensis. Mathematics - Informatics
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