Mathematical Inequalities & Applications · Volume 17, Issue 1 On the super-stability of trigonometric Hilbert-valued functional equations 17-20 Pages 249-258 DOI 10.7153/mia-17-20 Downloads Short PDF Full PDF PNG Authors Hamid Rezaei Keywords trigonometric functions stability super-stability Hilbert-valued function Subject classes 39B72 39B82 46E40