nearly isometric spaces

nearly isometric spaces

[¦nir·lē ‚ī·sə‚me·trik ′spās·əz]
(mathematics)
Two Banach spaces, A and B, such that for any numbers c < 1="" and="">d > 1 there is a bijective mapping, f, from A to B such that the norm of f (x) divided by the norm of x lies in the interval [c,d ].