Functions in complex Cl_(0, n+1) are important candidates to study solutions of complex equations in elastic mechanics, fluid mechanics and Maxwell's equations. In this paper, the solutions of a series of complex partial differential equations in multiple complex analysis are connected with the hyperbolic harmonic functions in complex Cl_(0, n+1), and some properties of hyperbolic harmonic functions are studied in detail. Furthermore, sufficient and necessary conditions of hyperbolic harmonic functions are obtained.
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