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It is shown on the bottom of the reference manual page for vector fields, using the at method:

p = E((0,0,0), name='p')
show(curl_v.at(p).display())

$$\mathrm{curl}\left(v\right) = -2 e_{ z }$$

(For some reason, the point is not displayed in the notation. Not sure why this is. I would expect it as a subscript.)