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This paper discusses the trajectory and prominence of NEDEM (Centre for the Study and Dissemination of Teaching of Mathematics), which is a group that in the 1960s spread the Modern Math Movement in Paraná’s state in Brazil. Based on historical sources constituted during the elaboration of eight Master and two Doctor theses, concluded in the first decades of the year 2000, in the Postgraduate Program of the Pontifical Catholic University of Paraná’s State, the study, 1 Uma versão preliminar da pesquisa foi apresentada no IV CIHEM – Congresso Ibero-americano de História de Educação Matemática em Múrcia (Espanha) no ano de 2017. Autor correspondente: Neuza Bertoni Pinto. Email: neuzabertonip@gmail.com

"It is not hard to teach Math": The prominence of Nedem in the diffusion of Modern Math in Paraná’s State