Cordial greeting.
I recently came across an exercise that asks me to demonstrate bijectivity between two lines in a projective plane.
But firstly, I would like to know how bijectivity is demonstrated to apply it to that topic.
I would be very grateful for any contribution or guide that you give me, thank you from beforehand.
my question is given based on this exercise:
In a projective plane: Given two different lines $L$ and $M$, there is a bijection $f: L \to M.$