Supported by National Natural Science Foundation of China(Grant Nos.11071201 and 11001231)
Let X, Y be two real Banach spaces and ε≥0. A map f : X → Y is said to be a standard ε-isometry if│││f/(x) - f(y)││ - ]ix - Y││x-y││ ε for all x,y C X and with f(O) = O. We say that a pair of Ban...