Abstract
The paper of Andrzej Grzegorczyk [19] on hierachy of the primitive recursive classes dates for 1953. This is the most frequently cited article of Polish author in computer science literature, having some hundreds citations. Moreover, many citations are in the papers of eminent computer scientists e.g. [10,24,33,34,31], sometimes the laureates of prestigious awards. In this paper we make an attempt to present Andrzej Grzegorczyk as a computer scientist.
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