- #1
m_kosak
- 1
- 0
who can help me?
ı want to prove this
If f : X → Y is injective and A is a subset of X, then f −1(f(A)) = A.
but how can I do this :(
ı want to prove this
If f : X → Y is injective and A is a subset of X, then f −1(f(A)) = A.
but how can I do this :(