Title of article
Boundedness of approximate trigonometric functions
Author/Authors
Kim، نويسنده , , Gwang Hui and Lee، نويسنده , , Young Whan، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2009
Pages
5
From page
439
To page
443
Abstract
In this work, we prove that approximate trigonometric functions are bounded. That is, if a non-zero function f satisfies the inequality | f ( x + y ) − f ( x − y ) − 2 f ( x ) f ( y ) | ≤ φ ( x ) or φ ( y ) , then f is bounded.
Keywords
Alembert equation , Sine functional equation , Trigonometric functional equation , Functional inequality
Journal title
Applied Mathematics Letters
Serial Year
2009
Journal title
Applied Mathematics Letters
Record number
1525802
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