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Exercise 35 - Chapter 4

edited August 2018

Explain why the companion $$\widehat{\mathrm{id}}$$ of $$\mathrm{id}:\mathcal{P}\to\mathcal{P}$$ really has the formula given in Eq. \eqref{eq1}.

$$\label{eq1}\tag{4.25}U_{\mathcal{X}}(x,y):=\mathcal{X}(x,y).$$
