I want help understanding this example on doubly robust moment conditions.

No following text helps explain this example as it is independent of the earlier text.

The things I don't understand is the meaning of are: In the small psi equation right in the middle of the example (the equation standing free of text in the middel), I would be glad to know what every thing is and why a "small $d$" is used, why divide with "$\pi$", why add $\mu(x)$ and why subtract $\theta$. Can anybody tell me why small $\psi$ looks as it does and where in the world that "formula" come from. It looks like a $z$-value buy I dont know! $$ ???\quad\frac{d(y-\mu(x))}{\pi(x)} + \mu(x) - \theta\quad??? $$

Example 1


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