I'm not sure this is the right forum, I hope the moderator will move it if necessary.
(1) I have to sketch level sets , c=1, 0, -1, for the function
I know level sets are but how do i sketch this? :(
(2) Let be the inverse of stereographic projection from to the equatorial hiperplane . Show that for every vector exists such that
I don't even know how to start..
Thank you for your time and help!