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  <controlfield tag="003">OSt</controlfield>
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   <subfield code="a">Heitor, Santos</subfield>
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   <subfield code="a">Matemática</subfield>
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   <subfield code="a">Bom estado de conservação. Impressão a preto, branco e vermelho. Edição experimental para 1972/73, de acordo com o programa de 1967. Preço 60 escudos.        Conteúdo:        1- Rudimentos da teoria de conjuntos.    2- Operações com conjuntos.     3- Relações binárias.     4- Aplicações.     5- Translações do plano.    6- O conjunto Z.    7- Operações em Z.</subfield>
   <subfield code="a">nivel:  Libro para   Ensino Secundario Técnico  .</subfield>
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