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uo to some extent! But, I would like to ask necessary and sufficient conditions for isomorphism of semidirect products. Obviously, every homomorphism from H to Aut(N) will give a semidirect product, but using these two facts, we can consider less homomorphimsms to construct all possible semidirect products. Even then, some semidirect products become isomorphic. It happens in construction of small p-groups.
