- #1
pakkanen
- 12
- 0
Homework Statement
Task: Show that U = {(x, y) | xy ≥ 0} is not a subspace of vector space R2
I wish you could help me to understand why U is not a subspace of R2x2.
I have actually found a vectors u and v such that it does not belong to U (e.g. (-3,-1) +(2,2) = (-1,1) ) but is that sufficient to show that U is not a subset of R2x2?