Suppose that
M={(a b ;a,b,c belong to R
-b c)
and N={(x 0 ;x,y belong to R
y 0)
are subspaces of M2R. Show that (M:R) + (N:R) = ((M'intersect'N):R) + ((M+N):R)
Cheers, Shaun
I think that these are the same problem.
http://www.mathhelpforum.com/math-he...ons-basis.html