The present volume contains the material of an introductory course on the Haar integral which the author had the opportunity of giving successively, during the second semester of 1959, at the Faculdade National de Filosofia of the University of Brazil (Rio de Janeiro, Guanabara) and at the Instituto de Fisica e Matemtica of the University of Recife (Recife, Pernambuco).
This text is written with the main concern of making it reasonably self-sufficient: it presupposes of the reader only a rudimentary knowledge of the Stieltjes and Lebesgue integrals, of algebra, and of general topology.
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