Does someone know what I'm doing wrong? I'm struggling with this for a while now and I don't see what I do wrong!
$$1+1=$$$$1+\sqrt{1}=$$$$1+\sqrt{-1*-1}=$$$$1+\sqrt{-1}*\sqrt{-1}=$$$$1+i*i=$$$$1-1=0$$
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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