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This may be a stupid question but I was reading the proof of Cauchy-Riemann equations from Wolfram MathWorld. Here, they seem to have put $\frac{\partial x}{\partial z} = \frac{1}{2}$. Shouldn't this be 1 as $z=x+iy$ and $x$ and $y$ are independent variables?

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This should be migrated to Math.

$x$ can be written as a function of $z$ as $x = \frac{z+z^*}{2}$

Differentiating with respect to $z$ we get $\frac{\partial x}{\partial z} = \frac{1}{2}$

One part that may seem odd is that the complex conjugate of $z$ is treated as a constant under the differentiation with respect to $z$. An in-depth answer to why this is can be found here: https://math.stackexchange.com/q/85648/

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