Extension of ๐ถ^{โ} functions defined in a half space
Extension of ๐ถ^{โ} functions defined in a half space
The following question arises in connection with manifolds with boundary: given a function f defined and Co in a half space, and all of whose derivatives have continuous limits at the boundary, can f be extended to a Coo function in the whole space? More specifically, let xERn, tER, S+ โฆ