quasi
Posts:
12,067
Registered:
7/15/05


Re: Question about linear algebra matrix pnorm
Posted:
Jan 9, 2013 2:42 AM


"rrr @gmail.com" wrote:
>I do not understand the symbol \{0}. > >Could you explain it to me? > >............. >Consider the function f: (R^n)\{0} > R defined by
If A,B are sets, A\B = {a in A  a not in B}.
A\B is called the relative complement of B in A since it's the set of elements not in B, relative to a universe of A.
The operation (A,B) > A\B is called set subtraction, and a common alternate notation for A\B is AB.
Thus, regarding the elements of R^n as vectors, (R^n)\{0} denotes the set of vectors in R^n other than the zero vector.
quasi

