Let be a subset of be a function, be an interior point of , and let be a vector in . I want to show if is differentiable at , then is also differentiable in the direction at , and

where

Thanks

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- December 2nd 2010, 03:08 AMbram kierkelsDirectional derivative
Let be a subset of be a function, be an interior point of , and let be a vector in . I want to show if is differentiable at , then is also differentiable in the direction at , and

where

Thanks - December 2nd 2010, 03:14 AMHallsofIvy
What is your definition of

1) Differentiable

2) Differentiable in the direrction*v*? - December 2nd 2010, 04:43 AMbram kierkels
- December 2nd 2010, 06:47 AMOpalg