
Re: Orthogonal complement
Posted:
Mar 3, 2013 8:16 PM


In <9s07j89ui5l98kpkfnmv1l2oq5ocdt14tg@4ax.com>, on 03/03/2013 at 11:11 AM, David C. Ullrich <ullrich@math.okstate.edu> said:
>Maybe the "+" was supposed to mean _direct_ sum? It seems likely >that it's easy to show that f is nondegenerate if and only if S >intersect C(S) = 0 for all S.
Let f be a Lorentz metric, s nonzero with f(s,s)=0 and S = {s}. Then S intersect C(S) is nonnull.
 Shmuel (Seymour J.) Metz, SysProg and JOAT <http://patriot.net/~shmuel>
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