Does there exist a continuous surjection $f:(0,1]\to (0,1)$?
My try: Let $f(1)=a\in (0,1)$. So the map could not be monotone. Is that mean the image set must contain the maximum?
Does there exist a continuous surjection $f:(0,1]\to (0,1)$?
My try: Let $f(1)=a\in (0,1)$. So the map could not be monotone. Is that mean the image set must contain the maximum?