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Suppose I {\displaystyle I} is an indexing set and G i , H i {\displaystyle G_{i},H_{i}} are 1-isomorphic groups (?) for each i ∈ I {\displaystyle i\in I} . Then, the External direct product (?) of the G i {\displaystyle G_{i}} s is 1-isomorphic to the external direct product of the H i {\displaystyle H_{i}} s.
