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Posted: **Wed Jul 13, 2022 5:08 am**

: Problem 15 Give An Example Of A Function F R2 R That Is Continuous At 0 Whose Directional Derivatives F 0 U Exist Fo 1 (56.43 KiB) Viewed 71 times

Problem 15. Give an example of a function f:R2→R that is continuous at 0 , whose directional derivatives f(0;u) exist for all u∈R2 but is not differentiable at 0 . Prove all your claims.