- #1
JoshMaths
- 26
- 0
Homework Statement
Show SoT is invertible iff
kerT = {0}
ImS = W
ImT n kerS = {0} and ImtT (+) kerS = V
T: U -> V
S: V -> W
The Attempt at a Solution
We know if kerSoT = {0} and kerT C kerSoT then kerT = {0}
ImS = W is implying surjectivity?
SoT = S(Tu) = Sv = W = ImS for all v (belongs to) ImT
I know the last part is stating the rank-nullity theorem but in a way I have not seen. If the kernel of S is zero then doesn't ImT = V or is kerS not necessarily zero?
I am also have difficulty with the whole premise of using set notations to explain properties of linear maps so if you could provide some guidance on this that would be great.
Josh