- #1
anachin6000
- 51
- 3
So, it is known and easy to prove that if you have f : D -> G and g : G -> B then
-if both f and g have the same monotony => fοg is increasing
-if f and g have different monotony => fοg is decreasing
But the reciprocal of this is not always true (easy to prove with a contradicting example).
Though, it came to my mind that, if we have a function h : D -> D, a kind of of reciprocal might be valid for hοh.
I think that if hοh is monotonic it results that h is either decreasing or increasing, but I am not sure if it is true or not, neither how to prove or disprove it. This is actually my question, is it true and how you prove that?
-if both f and g have the same monotony => fοg is increasing
-if f and g have different monotony => fοg is decreasing
But the reciprocal of this is not always true (easy to prove with a contradicting example).
Though, it came to my mind that, if we have a function h : D -> D, a kind of of reciprocal might be valid for hοh.
I think that if hοh is monotonic it results that h is either decreasing or increasing, but I am not sure if it is true or not, neither how to prove or disprove it. This is actually my question, is it true and how you prove that?