z=f(x,y) z<=x2+y2 and this function only gets positive values. Find if this function has differencial in o(0,0)

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- December 16th 2012, 10:00 AMhailydifferential of 2 functions with 2 variables
z=f(x,y) z<=x2+y2 and this function only gets positive values. Find if this function has differencial in o(0,0)

- December 16th 2012, 10:42 AMa tutorRe: differential of 2 functions with 2 variables
Somebody smarter than me might guess what you're talking about but I don't understand your question.

Can you make it clearer? - December 16th 2012, 10:59 AMhailyRe: differential of 2 functions with 2 variables
hmmm you may be right because english is not my native language i will try to explain it better,

first of all the function is not given but it is said it is a function with 2 variables. than it is said that f(x,y) ≤ x2+y2 . I have to find if this function that is not given has differencial in A(0,0)