Construct an isomorphism(adsbygoogle = window.adsbygoogle || []).push({});

A4 (AND) D4 ---> (Z/2,+)X(Z/2,+)

where D4's the symmetries of the square

so I found D4(And)A4={(13)(24),Id,(12)(34),(14)(23)}

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# HELP PLEASE -Isomorphisms Really Hard

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