I was reading
functions, I came across this question,
Next, the author has given an exercise to find out 3 things from the example,
1. Onto 2. Everywhere defined 3. One to one
I am stuck with how do I come to know if it has these there qualities? I mean if I had values I could have come up with an answer easily but with just a function formula, I don't get how to proceed. Please guide me.