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Hello my question is if there exist an analogue of "complex calculus" for complex numbers but using "quaternions"..in fact if we define the Quaternion.. [tex] a+ib+jc+kd [/tex] with the "commutation relations" [tex] [x_i ,x_j ]=\epsilon _{ijk} x_k [/tex] then i would like to know if there exist the equivalent to..

a) "Cauchy-Riemann" equation...( Harmonic functions ?)

b) "cauchy integral formula" (for Surface, Volume or line integrals on this space)

Of course the can be very 2fruitful" specially when studying Relativity since you could consider the Quaternion:

[tex] Q= cdt-idx-jdy-kdz [/tex] (x,y,z) space coordinates and t the time.:grumpy: :grumpy:

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# Quaternion complex calculus?

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