JENSEN TYPE QUADRATIC-QUADRATIC MAPPING IN BANACH SPACES

Choon-Kil Park, Seong-Ki Hong, Myoung-Jung Kim
2006 Bulletin of the Korean Mathematical Society  
Let X, Y be vector spaces. It is shown that if an even mapping f : X → Y satisfies f (0) = 0 and (0.
doi:10.4134/bkms.2006.43.4.703 fatcat:ga2at5oqdfaljndeot3kmg2oni