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Hello I am totally new to microlocal analysis and I have a question. Is the cone $\Sigma(T)$ orthogonal to the singular support of a distribution?
$$\xi \notin \Sigma(T) \iff \exists V\ conic\ neighbourhood\ of\ \xi;\ \forall \eta \in V, \ \forall N,\ |\widehat{T}(\eta)|\le C_N (1+|\eta|)^{-n}$$

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