- #1
supermiedos
- 63
- 0
Homework Statement
Here, V is a vector space.
a) Show that identity element of addition is unique.
b) If v, w and 0 belong to V and v + w = 0, then w = -v
Homework Equations
The Attempt at a Solution
a)
If u, 0', 0* belong to V, then
u + 0' = u
u + 0* = u
Adding the additive inverse on both sides of the equations:
0' = u -u
0* = u - u
So, 0' = 0*. Therefore, the identity element of addition is unique.
b) If v, w and 0 belong to V and v + w = 0, then w = -v
v + w + (-v) = 0 + (-v)
w + 0 = 0 + (-v)
w = -v
Is that correct? Because I often see the procedure is more complex.
Thanks in advance