For example:
Suppose A,B, C are sets and f :A-->B.
Suppose C has at least two elementss and for functions g and h from B to C, if g°f = h°f then g = h. Prove that f is onto.
Now I understand the answer in the book, but I would have never thought of it myself. I just couldn't do it.
How would you solve it, please explain your thought process.
Suppose A,B, C are sets and f :A-->B.
Suppose C has at least two elementss and for functions g and h from B to C, if g°f = h°f then g = h. Prove that f is onto.
Now I understand the answer in the book, but I would have never thought of it myself. I just couldn't do it.
How would you solve it, please explain your thought process.
