October 29th, 2011, 06:46 PM  #1 
Newbie Joined: Oct 2011 Posts: 14 Thanks: 0  differentiable function
Find all p and q that function is defferentiable in . Does anyone give any clue? 
October 31st, 2011, 03:09 PM  #2 
Member Joined: Nov 2009 From: France Posts: 98 Thanks: 0  Re: differentiable function
We can show that is differentiable if (I guess it's in the sum) (the identically map is the differential), and not differentiable if . In the case , consider the two subcases or .


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