Set of all derivations of a germ at a point
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Note: not to be confused with: Set of all derivations at a point
Definition
[math]\mathcal{D}_p(\mathbb{R}^n)[/math][1][2] denotes the set of all derivations of the form [math]D:C^\infty_p(\mathbb{R}^n)\rightarrow\mathbb{R}[/math], that is - it is a derivation of a set of germs - which is The set of all germs of smooth functions at a point.
