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In this video we study the set Zn of the residual classes modulo n 1 Definition of divisibility 2 Definition of congruence 3 Proof that the congruence relation is an equivalence relation 4 Proof: the equivalence classes with respect to the previous congruence relation form a partition of the set of integers Faculty of Sciences National Autonomous University of Mexico #unam #facultyofsciences #cienciasunam #science #mexico #mathematics #scientificdissemination #scientificdissemination #algebra #modernalgebra