- 86

- 0

Ok, I know I need to show that:

1. For all u and v in the intersection, it must imply that u+v is in the intersection, and

2. For all u in the intersection and c in some field, cu must be in the intersection.

I can show both 1. and 2. for the trivial case where the intersection is zero, but I'm not sure what I need to do for the arbitrary case.

Any suggestions?