Could you help me to find a quotient mapping from $\mathbb R^2$ onto $\mathbb R^2\setminus \{(0,0)\}$?
Assume the standard topology on both spaces.
Thank you.
Could you help me to find a quotient mapping from $\mathbb R^2$ onto $\mathbb R^2\setminus \{(0,0)\}$?
Assume the standard topology on both spaces.
Thank you.