- #1
td21
Gold Member
- 177
- 8
I know that if V is a direct sum of U and W,
then
1. V=U+W
2 there is no intersection between U and W
However, in some books there is an equivalent condition:
3.Every v can be expressed uniquely as u+w
Why's that? Why can we be so sure about the word "unique"? Thanks.
then
1. V=U+W
2 there is no intersection between U and W
However, in some books there is an equivalent condition:
3.Every v can be expressed uniquely as u+w
Why's that? Why can we be so sure about the word "unique"? Thanks.