1. The problem statement, all variables and given/known data I was given the first definition but am not sure how to get the last 3 2. Relevant equations N/A 3. The attempt at a solution I tried taking sup (with restriction being llxll=1) on both sides of the inequation, llF(x)ll=<llFll llxll, but would eventually end up with sup(llF(x)ll ; llxll=1) = sup(llF(x)ll ; llxll=1). Is this the right way to start deriving those 3 equations or am I supposed to derive from the very first equation? Thanks for the help.