Giovanni Battista Rizza
Giovanni Battista Rizza is an Italian mathematician, working in the fields of complex analysis of several variables and in differential geometry he is known for his contribution to hypercomplex analysis, notably for extending Cauchys integral theorem and Cauchys integral formula to complex functions of a hypercomplex variable, the theory of pluriharmonic functions and for the introduction of the now called Rizza manifolds.
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Source: Wikipedia