- #1
Terrell
- 317
- 26
Homework Statement
Construct a subset of the x-y plane R2 that is
(a) closed under vector addition and subtraction, but not scalar multiplication.
Hint: Starting with u and v, add and subtract for (a). Try cu and cv
Homework Equations
vector addition, subtraction and multiplication
The Attempt at a Solution
i think it's impossible for a combination of two matrices of rank two to have a matrix beyond rank 2. i can get it down to rank 1 and rank 0 of course but that is still a subset of R2 and that still proves that it's closed under scalar multiplication