In a paper, it says: Infinitesimally, around a point $p$, $f$ may be expressed with respect to its local parameter as follows: $$f(z)\approx f(p)+f_z(p)z+f_\bar{z}(p)\bar{z}$$
How to get this?
2026-04-02 00:11:18.1775088678
How to explain this expression?
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