Solve Complex Derivative Problem: dy/dz=-i

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SUMMARY

The discussion focuses on solving the complex derivative problem represented by the equation dy/dz = -i, where z is defined as a complex number z = x + iy. The participants analyze the implications of the derivative being -i and emphasize the necessity of specifying which variable is held constant during differentiation. The conversation highlights the relationship between dz/dy and dy/dz, concluding that dy/dz = 1/i leads to the derivative being -i when z is treated as a complex variable.

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Tom83B
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There's this text that is supposed to help us with some problems in one competition (I could send the link, but it's pdf in czech...) and there's written, that y_{,z}=-i. It's about complex numbers so the z is probably a complex number, but I can't see why the derivative should be -i...
 
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Guessing: z = x + iy, dz/dy = i, dy/dz = 1/i = -i.
 
It needs to be stated what is being held constant in the derivative
for example we might write
y=-i(z-x)=(-i/2)(z-z*)
but
[-i(z-x)]z=-i
while
[(-i/2)(z-z*)]z=-i/2
 

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