I do not understand how to calculate addition two cardinals.
I know that the formula as follows:
if α and β are two cardinals, then
α+β=|{(a,0):a∈α}∪{(b,1):b∈β}|.
If α=R and β=N, what's cardinals of α+β?
I have injection f:A→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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