- #1
ragnes
- 4
- 0
f: A-->B is a function. A,B are sets.
Let A1, A2 be contained in/equal to A.
f(A1 intersection A2) is contained in OR equal to f(A1) intersection with f(A2). Show that the equality holds if f is an injection.
I know how to prove that it is contained, but not the equal/injection part. Help please!
Let A1, A2 be contained in/equal to A.
f(A1 intersection A2) is contained in OR equal to f(A1) intersection with f(A2). Show that the equality holds if f is an injection.
I know how to prove that it is contained, but not the equal/injection part. Help please!