Tuesday, 13 August 2013

elementary set theory - Cardinal arithmetic confusion: What is |BbbR|+|BbbN|?

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):aα}{(b,1):bβ}|.



If α=R and β=N, what's cardinals of α+β?

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