## On the differentiability of quaternion functions.(English)Zbl 1280.30022

Summary: Motivated by the general problem of extending the classical theory of holomorphic functions of a complex variable to the case of quaternion functions, we give a notion of an $$\mathbb H$$-derivative for functions of one quaternion variable. We show that the elementary quaternion functions introduced by Hamilton as well as the quaternion logarithm function possess such a derivative. We conclude by establishing rules for calculating $$\mathbb H$$-derivatives.

### MSC:

 30G35 Functions of hypercomplex variables and generalized variables
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