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Let f:G->H be a group homomorphism.
Prove or disprove the following statement.
1.Let a be an element of G. If f(a) is of finite order, then a is also of finite order.
2.Let f be a surjection. Then f is an isomorphism iff the order of the element f(a) is equal to the order of the element a , for all a belong to G.
First, I want to know if f is the trivial homorphism, then both will fail, right?
Second, if f is non-trivial homomorphism. Both will hold, right?
Finally, Please help me to prove both or give me counterexamples without considering the trivial homomorphism.
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