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texto impreso
Properties related with aggregation operators functions have been widely studied in literature. Nevertheless, few efforts have been dedicated to analyze those properties related with the family of operators in a global way. What should be the re[...]texto impreso
We show that there exist non-formal compact oriented manifolds of dimension n and with first Betti number b 1 = b ? 0 if and only if n ? 3 and b ? 2, or n ? (7 ? 2b) and 0 ? b ? 2. Moreover, we present explicit examples for each one of these cases.